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Wednesday, February 11, 2015

Microsoft Windows


From Wikipedia, the free encyclopedia

Microsoft Windows
Windows logo and wordmark - 2012.svg
Windows 8.1 Start screen.jpg
Screenshot of Windows 8.1, showing its Start screen
Developer Microsoft
Written in C, C++, Assembly[1]
Working state Publicly released
Source model Closed / Shared source
Initial release November 20, 1985; 29 years ago (1985-11-20), as Windows 1.0
Latest release 6.3.9600 (October 17, 2013; 15 months ago (2013-10-17)) [±][2]
Latest preview 10.0.9926[3] (January 23, 2015; 19 days ago (2015-01-23)) [±]
Marketing target Personal computing
Available in 137 languages[4]
Update method
Package manager Windows Installer (.msi), Windows Store (.appx)[5]
Platforms ARM, IA-32, Itanium, x86-64
Kernel type
Default user interface Windows shell
License Proprietary commercial software
Official website windows.microsoft.com

Microsoft Windows or Windows is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft. It consists of several families of operating systems, each of which cater to a certain sector of the computing industry. Active Windows families include Windows NT, Windows Embedded and Windows Phone; these may encompass subfamilies, e.g. Windows Embedded Compact (Windows CE) or Windows Server. Defunct Windows families include Windows 9x and Windows Mobile.

Microsoft introduced an operating environment named Windows on November 20, 1985 as a graphical operating system shell for MS-DOS in response to the growing interest in graphical user interfaces (GUIs).[6] Microsoft Windows came to dominate the world's personal computer market with over 90% market share, overtaking Mac OS, which had been introduced in 1984. However, since 2012, it sells less than Android when counting on all of the computing platforms Windows runs on (same as Android), not just desktop; in 2014, selling less than a quarter of Android.

As of April 2014, the most recent versions of Windows for personal computers, smartphones, server computers and embedded devices are respectively Windows 8.1, Windows Phone 8.1, Windows Server 2012 R2 and Windows Embedded 8. A specialized version of Windows runs on the Xbox One game console.

The next version of Windows is Windows 10 and is currently available as a technical preview; it is set for release for phones, tablets, laptops, and PCs in late 2015.

Genealogy

By marketing role

Microsoft, the developer of Windows, has registered several trademarks each of which denote a family of Windows operating systems that target a specific sector of the computing industry. As of 2014, the following Windows families are being actively developed:
The following Windows families are no longer being developed:
  • Windows 9x: An operating system that targeted consumers market. Discontinued because of suboptimal performance. (PC World called its last version, Windows ME, one of the worst products of all times.)[8] Microsoft now caters to the consumers market with Windows NT.
  • Windows Mobile: The predecessor to Windows Phone, it was a mobile phone operating system. The first version was called Pocket PC 2000; the third version, Windows Mobile 2003 is the first version to adopt the Windows Mobile trademark. The last version is Windows Mobile 6.5.

Version history

The term Windows collectively describes any or all of several generations of Microsoft operating system products. These products are generally categorized as follows:

Early versions

Windows 1.0, the first version, released in 1985

The history of Windows dates back to September 1981, when Chase Bishop, a computer scientist, designed the first model of an electronic device and project "Interface Manager" was started. It was announced in November 1983 (after the Apple Lisa, but before the Macintosh) under the name "Windows", but Windows 1.0 was not released until November 1985.[9] Windows 1.0 was to compete with Apple's operating system, but achieved little popularity. Windows 1.0 is not a complete operating system; rather, it extends MS-DOS. The shell of Windows 1.0 is a program known as the MS-DOS Executive. Components included Calculator, Calendar, Cardfile, Clipboard viewer, Clock, Control Panel, Notepad, Paint, Reversi, Terminal and Write. Windows 1.0 does not allow overlapping windows. Instead all windows are tiled. Only modal dialog boxes may appear over other windows.
Windows 2.0 was released in December 1987 and was more popular than its predecessor. It features several improvements to the user interface and memory management.[citation needed] Windows 2.03 changed the OS from tiled windows to overlapping windows. The result of this change led to Apple Computer filing a suit against Microsoft alleging infringement on Apple's copyrights.[10][11]
Windows 2.0 also introduced more sophisticated keyboard shortcuts and could make use of expanded memory.

Windows 2.1 was released in two different versions: Windows/286 and Windows/386. Windows/386 uses the virtual 8086 mode of Intel 80386 to multitask several DOS programs and the paged memory model to emulate expanded memory using available extended memory. Windows/286, in spite of its name, runs on both Intel 8086 and Intel 80286 processors. It runs in real mode but can make use of the high memory area.

In addition to full Windows-packages, there were runtime-only versions that shipped with early Windows software from third parties and made it possible to run their Windows software on MS-DOS and without the full Windows feature set.

The early versions of Windows are often thought of as graphical shells, mostly because they ran on top of MS-DOS and use it for file system services.[12] However, even the earliest Windows versions already assumed many typical operating system functions; notably, having their own executable file format and providing their own device drivers (timer, graphics, printer, mouse, keyboard and sound). Unlike MS-DOS, Windows allowed users to execute multiple graphical applications at the same time, through cooperative multitasking. Windows implemented an elaborate, segment-based, software virtual memory scheme, which allows it to run applications larger than available memory: code segments and resources are swapped in and thrown away when memory became scarce; data segments moved in memory when a given application had relinquished processor control.

Windows 3.0 and 3.1

Windows 3.0, released in 1990

Windows 3.0, released in 1990, improved the design, mostly because of virtual memory and loadable virtual device drivers (VxDs) that allow Windows to share arbitrary devices between multi-tasked DOS applications.[citation needed] Windows 3.0 applications can run in protected mode, which gives them access to several megabytes of memory without the obligation to participate in the software virtual memory scheme. They run inside the same address space, where the segmented memory provides a degree of protection. Windows 3.0 also featured improvements to the user interface. Microsoft rewrote critical operations from C into assembly. Windows 3.0 is the first Microsoft Windows version to achieve broad commercial success, selling 2 million copies in the first six months.[13][14]

Windows 3.1, made generally available on March 1, 1992, featured a facelift. In August 1993, Windows for Workgroups, a special version with integrated peer-to-peer networking features and a version number of 3.11, was released. It was sold along Windows 3.1. Support for Windows 3.1 ended on December 31, 2001.[15]

Windows 9x

The next major consumer-oriented release of Windows, Windows 95, was released on August 24, 1995. While still remaining MS-DOS-based, Windows 95 introduced support for native 32-bit applications, plug and play hardware, preemptive multitasking, long file names of up to 255 characters, and provided increased stability over its predecessors. Windows 95 also introduced a redesigned, object oriented user interface, replacing the previous Program Manager with the Start menu, taskbar, and Windows Explorer shell. Windows 95 was a major commercial success for Microsoft; Ina Fried of CNET remarked that "by the time Windows 95 was finally ushered off the market in 2001, it had become a fixture on computer desktops around the world."[16] Microsoft published four OEM Service Releases (OSR) of Windows 95, each of which was roughly equivalent to a service pack. The first OSR of Windows 95 was also the first version of Windows to be bundled with Microsoft's web browser, Internet Explorer.[17] Mainstream support for Windows 95 ended on December 31, 2000 and extended support for Windows 95 ended on December 31, 2001.[18]Windows 95 was followed up with the release of Windows 98 on June 25, 1998, which introduced the Windows Driver Model, support for USB composite devices, support for ACPI, hibernation, and support for multi-monitor configurations. Windows 98 also included integration with Internet Explorer 4 through Active Desktop and other aspects of the Windows Desktop Update (a series of enhancements to the Explorer shell which were also made available for Windows 95). In May 1999, Microsoft released Windows 98 Second Edition, an updated version of Windows 98. Windows 98 SE added Internet Explorer 5.0 and Windows Media Player 6.2 amongst other upgrades. Mainstream support for Windows 98 ended on June 30, 2002 and extended support for Windows 98 ended on July 11, 2006.[19]

On September 14, 2000, Microsoft released Windows ME (Millennium Edition), the last DOS-based version of Windows. Windows ME incorporated visual interface enhancements from its Windows NT-based counterpart Windows 2000, had faster boot times than previous versions (which however, required the removal of the ability to access a real mode DOS environment, removing compatibility with some older programs),[20] expanded multimedia functionality (including Windows Media Player 7, Windows Movie Maker, and the Windows Image Acquisition framework for retrieving images from scanners and digital cameras), additional system utilities such as System File Protection and System Restore, and updated home networking tools.[21] However, Windows ME was faced with criticism for its speed and instability, along with hardware compatibility issues and its removal of real mode DOS support. PC World considered Windows ME to be one of the worst operating systems Microsoft had ever released, and the 4th worst tech product of all time.[8]

Windows NT

Early versions

In November 1988, a new development team within Microsoft (which included former Digital Equipment Corporation developers Dave Cutler and Mark Lucovsky) began work on a revamped version of IBM and Microsoft's OS/2 operating system known as "NT OS/2". NT OS/2 was intended to be a secure, multi-user operating system with POSIX compatibility and a modular, portable kernel with preemptive multitasking and support for multiple processor architectures. However, following the successful release of Windows 3.0, the NT development team decided to rework the project to use an extended 32-bit port of the Windows API known as Win32 instead of those of OS/2. Win32 maintained a similar structure to the Windows APIs (allowing existing Windows applications to easily be ported to the platform), but also supported the capabilities of the existing NT kernel.
Following its approval by Microsoft's staff, development continued on what was now Windows NT, the first 32-bit version of Windows. However, IBM objected to the changes, and ultimately continued OS/2 development on its own.[22][23]

The first release of the resulting operating system, Windows NT 3.1 (named to associate it with Windows 3.1) was released in July 1993 with versions for desktop workstations and servers. Windows NT 3.5 was released in September 1994, focusing on performance improvements and support for Novell's NetWare, and was followed up by Windows NT 3.51 in May 1995, which included additional improvements and support for the PowerPC architecture. Windows NT 4.0 was released in June 1996, introducing the redesigned interface of Windows 95 to the NT series. On February 17, 2000, Microsoft released Windows 2000, a successor to NT 4.0. The Windows NT name was dropped at this point in order to put a greater focus on the Windows brand.[23]

Windows XP

The next major version of Windows, Windows XP, was released on October 25, 2001. The introduction of Windows XP aimed to unify the consumer-oriented Windows 9x series with the architecture introduced by Windows NT, a change which Microsoft promised would provide better performance over its DOS-based predecessors. Windows XP would also introduce a redesigned user interface (including an updated Start menu and a "task-oriented" Windows Explorer), streamlined multimedia and networking features, Internet Explorer 6, integration with Microsoft's .NET Passport services, modes to help provide compatibility with software designed for previous versions of Windows, and Remote Assistance functionality.[24]

At retail, Windows XP was now marketed in two main editions: the "Home" edition was targeted towards consumers, while the "Professional" edition was targeted towards business environments and power users, and included additional security and networking features. Home and Professional were later accompanied by the "Media Center" edition (designed for home theater PCs, with an emphasis on support for DVD playback, TV tuner cards, DVR functionality, and remote controls), and the "Tablet PC" edition (designed for mobile devices meeting its specifications for a tablet computer, with support for stylus pen input and additional pen-enabled applications).[25][26][27] Mainstream support for Windows XP ended on April 14, 2009. Extended support ended on April 8, 2014.[28]

After Windows 2000, Microsoft also changed its release schedules for server operating systems; the server counterpart of Windows XP, Windows Server 2003, was released in April 2003.[23] It was followed in December 2005 by Windows Server 2003 R2.

Windows Vista and later

After a lengthy development process, Windows Vista was released on November 30, 2006 for volume licensing and January 30, 2007 for consumers. It contained a number of new features, from a redesigned shell and user interface to significant technical changes, with a particular focus on security features. It was available in a number of different editions, and has been subject to some criticism. Vista's server counterpart, Windows Server 2008 was released in early 2008.

On July 22, 2009, Windows 7 and Windows Server 2008 R2 were released as RTM (release to manufacturing) while the former was released to the public 3 months later on October 22, 2009.
Unlike its predecessor, Windows Vista, which introduced a large number of new features, Windows 7 was intended to be a more focused, incremental upgrade to the Windows line, with the goal of being compatible with applications and hardware with which Windows Vista was already compatible.[29] Windows 7 has multi-touch support, a redesigned Windows shell with an updated taskbar, a home networking system called HomeGroup,[30] and performance improvements.

Windows 8, the successor to Windows 7, was released generally on October 26, 2012. A number of significant changes were made on Windows 8, including the introduction of a user interface based around Microsoft's Metro design language with optimizations for touch-based devices such as tablets and all-in-one PCs. These changes include the Start screen, which uses large tiles that are more convenient for touch interactions and allow for the display of continually updated information, and a new class of apps which are designed primarily for use on touch-based devices. Other changes include increased integration with cloud services and other online platforms (such as social networks and Microsoft's own SkyDrive and Xbox Live services), the Windows Store service for software distribution, and a new variant known as Windows RT for use on devices that utilize the ARM architecture.[31][32][33][34][35][36] An update to Windows 8, called Windows 8.1, was released on October 17, 2013, and includes features such as new live tile sizes, deeper SkyDrive integration, and many other revisions.[37]

On September 30, 2014, Microsoft announced Windows 10 as the successor to Windows 8.1. It will be released in late 2015 and addresses shortcomings in the user interface first introduced with Windows 8. Changes include the return of the Start Menu, a virtual desktop system, and the ability to run Windows Store apps within windows on the desktop rather than in full-screen mode.[38]

Multilingual support

Multilingual support is built into Windows. The language for both the keyboard and the interface can be changed through the Region and Language Control Panel. Components for all supported input languages, such as Input Method Editors, are automatically installed during Windows installation (in Windows XP and earlier, files for East Asian languages, such as Chinese, and right-to-left scripts, such as Arabic, may need to be installed separately, also from the said Control Panel). Third-party IMEs may also be installed if a user feels that the provided one is insufficient for their needs.

Interface languages for the operating system are free for download, but some languages are limited to certain editions of Windows. Language Interface Packs (LIPs) are redistributable and may be downloaded from Microsoft's Download Center and installed for any edition of Windows (XP or later) - they translate most, but not all, of the Windows interface, and require a certain base language (the language which Windows originally shipped with). This is used for most languages in emerging markets. Full Language Packs, which translates the complete operating system, are only available for specific editions of Windows (Ultimate and Enterprise editions of Windows Vista and 7, and all editions of Windows 8, 8.1 and RT except Single Language). They do not require a specific base language, and are commonly used for more popular languages such as French or Chinese. These languages cannot be downloaded through the Download Center, but available as optional updates through the Windows Update service (except Windows 8).

The interface language of installed applications are not affected by changes in the Windows interface language. Availability of languages depends on the application developers themselves.

Windows 8 and Windows Server 2012 introduces a new Language Control Panel where both the interface and input languages can be simultaneously changed, and language packs, regardless of type, can be downloaded from a central location. The PC Settings app in Windows 8.1 and Windows Server 2012 R2 also includes a counterpart settings page for this. Changing the interface language also changes the language of preinstalled Windows Store apps (such as Mail, Maps and News) and certain other Microsoft-developed apps (such as Remote Desktop). The above limitations for language packs are however still in effect, except that full language packs can be installed for any edition except Single Language, which caters to emerging markets.

Platform support

Windows NT included support for several different platforms before the x86-based personal computer became dominant in the professional world. Windows NT 4.0 and its predecessors supported PowerPC, DEC Alpha and MIPS R4000. (Although some these platforms implement 64-bit computing, the operating system treated them as 32-bit.) However, Windows 2000, the successor of Windows NT 4.0, dropped support for all platforms except the third generation x86 (known as IA-32) or newer in 32-bit mode. The client line of Window NT family still runs on IA-32, although the Windows Server line has ceased supporting this platform with the release of Windows Server 2008 R2.

With the introduction of the Intel Itanium architecture (IA-64), Microsoft released new versions of Windows to support it. Itanium versions of Windows XP and Windows Server 2003 were released at the same time as their mainstream x86 counterparts. Windows XP 64-Bit Edition, released in 2005, is the last Windows client operating systems to support Itanium. Windows Server line continued to support this platform until Windows Server 2012; Windows Server 2008 R2 is the last Windows operating system to support Itanium architecture.

On April 25, 2005, Microsoft released Windows XP Professional x64 Edition and Windows Server 2003 x64 Editions to support the x86-64 (or simply x64), the eighth generation of x86 architecture. Windows Vista was the first client version of Windows NT to be released simultaneously in IA-32 and x64 editions. x64 is still supported.

An edition of Windows 8 known as Windows RT was specifically created for computers with ARM architecture.

Windows CE

The latest current version of Windows CE, Windows Embedded Compact 7, displaying a concept media player UI.

Windows CE (officially known as Windows Embedded Compact), is an edition of Windows that runs on minimalistic computers, like satellite navigation systems and some mobile phones. Windows Embedded Compact is based on its own dedicated kernel, dubbed Windows CE kernel. Microsoft licenses Windows CE to OEMs and device makers. The OEMs and device makers can modify and create their own user interfaces and experiences, while Windows CE provides the technical foundation to do so.

Windows CE was used in the Dreamcast along with Sega's own proprietary OS for the console. Windows CE was the core from which Windows Mobile was derived. Its successor, Windows Phone 7, was based on components from both Windows CE 6.0 R3 and Windows CE 7.0. Windows Phone 8 however, is based on the same NT-kernel as Windows 8.

Windows Embedded Compact is not to be confused with Windows XP Embedded or Windows NT 4.0 Embedded, modular editions of Windows based on Windows NT kernel.

Xbox OS

Xbox OS is an unofficial name given to the version of Windows that runs on the Xbox One.[39] It is a more specific implementation with an emphasis on virtualization (using Hyper-V) as it is three operating systems running at once, consisting of the core operating system, a second implemented for games and a more Windows-like environment for applications.[40]

Timeline of releases


The Windows family tree

Usage share

Windows (desktop) market share as of December 2014
Source Net Market Share[43] StatCounter[44] W3Counter[45]
Windows 7 56.26% 54.4% 40.54%
Windows XP 18.26% 13.21% 9.04%
Windows 8.1 9.49% 13.03% 8.14%
Windows 8 4.03% 4.67% 2.85%
Windows Vista 2.9% 3.15% 2.1%
All versions 90.94% 88.46% 62.67%
^ Not a subtotal. Not all versions are listed in this table.
^ Also includes mobile operating systems.

Usage share as a general platform

According to Gartner, Windows (including all platforms) sold less than a quarter of Android (the so-called mobile operating system) in 2014,[46] and has been outsold every year since 2012. Android runs on tablets ("personal computers"), smartphones (and traditional PCs but few users do). In 2013, Android-based devices outsold Windows' 2.8:1 (2:1 in mature markets) or by 573 million units (estimating the gap to widen much in 2015 as it did in 2014).[47][48][49]

An estimated three billion Android smartphones only (with tablets selling similar to desktop PCs) have been sold by the end of 2014 (including previous years) rivaling Windows installed base in PCs.
Unlike Android, programs may not work across different versions of Windows, but that is planned in Windows 10.

Security

Consumer versions of Windows were originally designed for ease-of-use on a single-user PC without a network connection, and did not have security features built in from the outset.[50] However, Windows NT and its successors are designed for security (including on a network) and multi-user PCs, but were not initially designed with Internet security in mind as much, since, when it was first developed in the early 1990s, Internet use was less prevalent.[51]

These design issues combined with programming errors (e.g. buffer overflows) and the popularity of Windows means that it is a frequent target of computer worm and virus writers. In June 2005, Bruce Schneier's Counterpane Internet Security reported that it had seen over 1,000 new viruses and worms in the previous six months.[52] In 2005, Kaspersky Lab found around 11,000 malicious programs—viruses, Trojans, back-doors, and exploits written for Windows.[53]

Microsoft releases security patches through its Windows Update service approximately once a month (usually the second Tuesday of the month), although critical updates are made available at shorter intervals when necessary.[54] In versions of Windows after and including Windows 2000 SP3 and Windows XP, updates can be automatically downloaded and installed if the user selects to do so. As a result, Service Pack 2 for Windows XP, as well as Service Pack 1 for Windows Server 2003, were installed by users more quickly than it otherwise might have been.[55]

While the Windows 9x series offered the option of having profiles for multiple users, they had no concept of access privileges, and did not allow concurrent access; and so were not true multi-user operating systems. In addition, they implemented only partial memory protection. They were accordingly widely criticised for lack of security.

The Windows NT series of operating systems, by contrast, are true multi-user, and implement absolute memory protection. However, a lot of the advantages of being a true multi-user operating system were nullified by the fact that, prior to Windows Vista, the first user account created during the setup process was an administrator account, which was also the default for new accounts. Though Windows XP did have limited accounts, the majority of home users did not change to an account type with fewer rights – partially due to the number of programs which unnecessarily required administrator rights – and so most home users ran as administrator all the time.

Windows Vista changes this[56] by introducing a privilege elevation system called User Account Control. When logging in as a standard user, a logon session is created and a token containing only the most basic privileges is assigned. In this way, the new logon session is incapable of making changes that would affect the entire system. When logging in as a user in the Administrators group, two separate tokens are assigned. The first token contains all privileges typically awarded to an administrator, and the second is a restricted token similar to what a standard user would receive. User applications, including the Windows Shell, are then started with the restricted token, resulting in a reduced privilege environment even under an Administrator account. When an application requests higher privileges or "Run as administrator" is clicked, UAC will prompt for confirmation and, if consent is given (including administrator credentials if the account requesting the elevation is not a member of the administrators group), start the process using the unrestricted token.[57]

File permissions

All Windows versions from Windows NT 3 have been based on a file system permission system referred to as AGLP (Accounts, Global, Local, Permissions) AGDLP which in essence where file permissions are applied to the file/folder in the form of a 'local group' which then has other 'global groups' as members. These global groups then hold other groups or users depending on different Windows versions used. This system varies from other vendor products such as Linux and NetWare due to the 'static' allocation of permission being applied directory to the file or folder. However using this process of AGLP/AGDLP/AGUDLP allows a small number of static permissions to be applied and allows for easy changes to the account groups without reapplying the file permissions on the files and folders.

Windows Defender

On January 6, 2005, Microsoft released a Beta version of Microsoft AntiSpyware, based upon the previously released Giant AntiSpyware. On February 14, 2006, Microsoft AntiSpyware became Windows Defender with the release of Beta 2. Windows Defender is a freeware program designed to protect against spyware and other unwanted software. Windows XP and Windows Server 2003 users who have genuine copies of Microsoft Windows can freely download the program from Microsoft's web site, and Windows Defender ships as part of Windows Vista and 7.[58] In Windows 8, Windows Defender and Microsoft Security Essentials have been combined into a single program, named Windows Defender. It is based on Microsoft Security Essentials, borrowing its features and user interface. Although it is enabled by default, it can be turned off to use another anti-virus solution.[59]
Windows Malicious Software Removal Tool and the optional Microsoft Safety Scanner are two other free security products offered by Microsoft.

Third-party analysis

In an article based on a report by Symantec,[60] internetnews.com has described Microsoft Windows as having the "fewest number of patches and the shortest average patch development time of the five operating systems it monitored in the last six months of 2006."[61]

A study conducted by Kevin Mitnick and marketing communications firm Avantgarde in 2004 found that an unprotected and unpatched Windows XP system with Service Pack 1 lasted only 4 minutes on the Internet before it was compromised, and an unprotected and also unpatched Windows Server 2003 system was compromised after being connected to the internet for 8 hours.[62] This study does not apply to Windows XP systems running the Service Pack 2 update (released in late 2004), which vastly improved the security of Windows XP.[citation needed] The computer that was running Windows XP Service Pack 2 was not compromised. The AOL National Cyber Security Alliance Online Safety Study of October 2004 determined that 80% of Windows users were infected by at least one spyware/adware product.[citation needed] Much documentation is available describing how to increase the security of Microsoft Windows products. Typical suggestions include deploying Microsoft Windows behind a hardware or software firewall, running anti-virus and anti-spyware software, and installing patches as they become available through Windows Update.[63]

Alternative implementations

Owing to the operating system's popularity, a number of applications have been released that aim to provide compatibility with Windows applications, either as a compatibility layer for another operating system, or as a standalone system that can run software written for Windows out of the box. These include:
  • Wine – a free and open-source implementation of the Windows API, allowing one to run many Windows applications on x86-based platforms, including UNIX, Linux and OS X. Wine developers refer to it as a "compatibility layer"[64] and use Windows-style APIs to emulate Windows environment.
    • CrossOver – a Wine package with licensed fonts. Its developers are regular contributors to Wine, and focus on Wine running officially supported applications.
    • Cedega – proprietary fork of Wine by TransGaming Technologies, designed specifically for running Microsoft Windows games on Linux. A version of Cedega known as Cider allows Windows games to run on OS X. Since Wine was licensed under the LGPL, Cedega has been unable to port the improvements made to Wine to their proprietary codebase. Cedega ceased its service in February 2011.
    • Darwine – a port of Wine for OS X and Darwin. Operates by running Wine on QEMU.
    • Linux Unified Kernel – A set of patches to the Linux kernel allowing first-class Windows executable files in Linux (using Wine DLLs) to use Windows drivers and be faster than interpreted Wine.
  • ReactOS – an open-source OS intended to run the same software as Windows, originally designed to simulate Windows NT 4.0, now aiming at Windows 7 compatibility. It has been in the development stage since 1996.
  • Linspire – formerly LindowsOS, a commercial Linux distribution initially created with the goal of running major Windows software. Changed its name to Linspire after Microsoft v. Lindows. Discontinued in favor of Xandros Desktop.
  • Freedows OS – an open-source attempt at creating a Windows clone for x86 platforms, intended to be released under the GNU General Public License. Started in 1996 by Reece K. Sellin, the project was never completed, getting only to the stage of design discussions which featured a number of novel concepts until it was suspended in 2002.[65][66][67]

Twitter


From Wikipedia, the free encyclopedia

Twitter, Inc.
Twitter bird logo 2012.svg
Twitter homepage.png
Twitter's homepage in February 2015
Type Public
Traded as NYSETWTR
Founded March 21, 2006 (2006-03-21)[1]
Headquarters San Francisco, California, United States[2]
Area served Worldwide
Founder(s) Jack Dorsey, Noah Glass, Biz Stone, Evan Williams
Key people Jack Dorsey (Chairman)
Dick Costolo (CEO)
Industry Internet
Revenue Increase US$664 million (2013)[3]
Employees 3,600 (2015)[4]
Subsidiaries Vine
Website twitter.com
Written in Java,[5][6] Ruby,[5] Scala,[5] JavaScript[5]
Alexa rank Decrease 8 (January 2015)[7]
Type of site Social network service
Registration Required to post, follow, or be followed
Users 284 million active (December 2014)[8]
Available in Multilingual
Launched July 15, 2006 (2006-07-15)[9]
Current status Active

Twitter is an online social networking service that enables users to send and read short 140-character messages called "tweets".

Registered users can read and post tweets, but unregistered users can only read them. Users access Twitter through the website interface, SMS, or mobile device app.[10] Twitter Inc. is based in San Francisco and has more than 25 offices around the world.[11]

Twitter was created in March 2006 by Jack Dorsey, Evan Williams, Biz Stone and Noah Glass and by July 2006 the site was launched. The service rapidly gained worldwide popularity, with more than 100 million users who in 2012 posted 340 million tweets per day.[12] The service also handled 1.6 billion search queries per day.[13][14][15] In 2013 Twitter was one of the ten most-visited websites, and has been described as "the SMS of the Internet."[7][16] As of December 2014, Twitter has more than 500 million users, out of which more than 284 million are active users.[8]

History

Creation and initial reaction


A blueprint sketch, c. 2006, by Jack Dorsey, envisioning an SMS-based social network.

Twitter's origins lie in a "daylong brainstorming session" held by board members of the podcasting company Odeo. Dorsey, then an undergraduate student at New York University, introduced the idea of an individual using an SMS service to communicate with a small group.[17][18] The original project code name for the service was twttr, an idea that Williams later ascribed to Noah Glass,[19] inspired by Flickr and the five-character length of American SMS short codes. The developers initially considered "10958" as a short code, but later changed it to "40404" for "ease of use and memorability."[20] Work on the project started on March 21, 2006, when Dorsey published the first Twitter message at 9:50 PM Pacific Standard Time (PST): "just setting up my twttr".[1] Dorsey has explained the origin of the "Twitter" title:
...we came across the word 'twitter', and it was just perfect. The definition was 'a short burst of inconsequential information,' and 'chirps from birds'. And that's exactly what the product was.[21]
The first Twitter prototype, developed by Dorsey and contractor Florian Weber, was used as an internal service for Odeo employees[22] and the full version was introduced publicly on July 15, 2006.[9]

In October 2006, Biz Stone, Evan Williams, Dorsey, and other members of Odeo, formed Obvious Corporation and acquired Odeo, together with its assets—including Odeo.com and Twitter.com—from the investors and shareholders.[23] Williams fired Glass, who was silent about his part in Twitter's startup until 2011.[24] Twitter spun off into its own company in April 2007.[25] Williams provided insight into the ambiguity that defined this early period in a 2013 interview:
With Twitter, it wasn't clear what it was. They called it a social network, they called it microblogging, but it was hard to define, because it didn't replace anything. There was this path of discovery with something like that, where over time you figure out what it is. Twitter actually changed from what we thought it was in the beginning, which we described as status updates and a social utility. It is that, in part, but the insight we eventually came to was Twitter was really more of an information network than it is a social network.[26]
The tipping point for Twitter's popularity was the 2007 South by Southwest Interactive (SXSWi) conference. During the event, Twitter usage increased from 20,000 tweets per day to 60,000.[27] "The Twitter people cleverly placed two 60-inch plasma screens in the conference hallways, exclusively streaming Twitter messages," remarked Newsweek's Steven Levy. "Hundreds of conference-goers kept tabs on each other via constant twitters. Panelists and speakers mentioned the service, and the bloggers in attendance touted it."[28]

Reaction at the conference was highly positive. Blogger Scott Beale said that Twitter "absolutely rul[ed]" SXSWi. Social software researcher danah boyd said Twitter "own[ed]" the conference.[29] Twitter staff received the festival's Web Award prize with the remark "we'd like to thank you in 140 characters or less. And we just did!" [30]

The first unassisted off-Earth Twitter message was posted from the International Space Station by NASA astronaut T. J. Creamer on January 22, 2010.[31] By late November 2010, an average of a dozen updates per day were posted on the astronauts' communal account, @NASA_Astronauts. NASA has also hosted over 25 "tweetups", events that provide guests with VIP access to NASA facilities and speakers with the goal of leveraging participants' social networks to further the outreach goals of NASA.

In August 2010, the company appointed Adam Bain from News Corp.'s Fox Audience Network as president of revenue.[32]

Growth

The company experienced rapid growth. It had 400,000 tweets posted per quarter in 2007. This grew to 100 million tweets posted per quarter in 2008. In February 2010, Twitter users were sending 50 million tweets per day.[33] By March 2010, the company recorded over 70,000 registered applications.[34] As of June 2010, about 65 million tweets were posted each day, equaling about 750 tweets sent each second, according to Twitter.[35] As of March 2011, that was about 140 million tweets posted daily.[36] As noted on Compete.com, Twitter moved up to the third-highest-ranking social networking site in January 2009 from its previous rank of twenty-second.[37]

Jack Dorsey, a co-founder and the chairman of Twitter, in 2009

Twitter's usage spikes during prominent events. For example, a record was set during the 2010 FIFA World Cup when fans wrote 2,940 tweets per second in the thirty-second period after Japan scored against Cameroon on June 14. The record was broken again when 3,085 tweets per second were posted after the Los Angeles Lakers' victory in the 2010 NBA Finals on June 17,[38] and then again at the close of Japan's victory over Denmark in the World Cup when users published 3,283 tweets per second.[39] The record was set again during the 2011 FIFA Women's World Cup Final between Japan and the United States, when 7,196 tweets per second were published.[40] When American singer Michael Jackson died on June 25, 2009, Twitter servers crashed after users were updating their status to include the words "Michael Jackson" at a rate of 100,000 tweets per hour.[41] The current record as of August 3, 2013 was set in Japan, with 143,199 tweets per second (beating the previous record of 33,388, also set by Japan after a television screening of the movie "Castle In The Sky").[42]

Twitter acquired application developer Atebits on April 11, 2010. Atebits had developed the Apple Design Award-winning Twitter client Tweetie for the Mac and iPhone. The application, now called "Twitter" and distributed free of charge, is the official Twitter client for the iPhone, iPad and Mac.[43]
From September through October 2010, the company began rolling out "New Twitter", an entirely revamped edition of twitter.com. Changes included the ability to see pictures and videos without leaving Twitter itself by clicking on individual tweets which contain links to images and clips from a variety of supported websites including YouTube and Flickr, and a complete overhaul of the interface, which shifted links such as '@mentions' and 'Retweets' above the Twitter stream, while 'Messages' and 'Log Out' became accessible via a black bar at the very top of twitter.com. As of November 1, 2010, the company confirmed that the "New Twitter experience" had been rolled out to all users.

On April 5, 2011, Twitter tested a new homepage and phased out the "Old Twitter." [44] However, a glitch came about after the page was launched, so the previous "retro" homepage was still in use until the issues were resolved; the new homepage was reintroduced on April 20.[45][46]

On December 8, 2011, Twitter overhauled its website once more to feature the "Fly" design, which the service says is easier for new users to follow and promotes advertising. In addition to the Home tab, the Connect and Discover tabs were introduced along with a redesigned profile and timeline of Tweets. The site's layout has been compared to that of Facebook.[47][48]

On February 21, 2012, it was announced that Twitter and Yandex agreed to a partnership. Yandex, a Russian search engine, finds value within the partnership due to Twitter's real time news feeds. Twitter's director of business development explained that it is important to have Twitter content where Twitter users go.[49]

On March 21, 2012, Twitter celebrated its sixth birthday while also announcing that it has 140 million users and sees 340 million tweets per day. The number of users is up 40% from their September 2011 number, which was said to have been at 100 million at the time.[50]

In April 2012, Twitter announced that it was opening an office in Detroit, with the aim of working with automotive brands and advertising agencies.[51] Twitter also expanded its office in Dublin.[52]

On June 5, 2012, a modified logo was unveiled through the company blog, removing the text to showcase the slightly redesigned bird as the sole symbol of Twitter.[53]

On October 5, 2012, Twitter acquired a video clip company called Vine that launched in January 2013.[54][55] Twitter released Vine as a standalone app that allows users to create and share six-second looping video clips on January 24, 2013. Vine videos shared on Twitter are visible directly in users' Twitter feeds.[56] Due to an influx of inappropriate content, it is now rated 17+ in Apple's app store.[57]

On December 18, 2012, Twitter announced it had surpassed 200 million monthly active users. Twitter hit 100 million monthly active users in September 2011.[58]

On April 18, 2013, Twitter launched a music app called Twitter Music for the iPhone.[59]


On August 28, 2013, Twitter acquired Trendrr,[60] followed by the acquisition of MoPub on September 9, 2013.[61]

As of September 2013, the company's data showed that 200 million users send over 400 million tweets daily, with nearly 60% of tweets sent from mobile devices.[62]

On June 4, 2014, Twitter announced that it will acquire Namo Media, a technology firm specializing in "native advertising" for mobile devices.[63]

On June 19, 2014, Twitter announced that it has reached an undisclosed deal to buy SnappyTV, a service that helps edit and share video from television broadcasts.[64][65] The company was helping broadcasters and rights holders to share video content both organically across social and via Twitter's Amplify program.[66]

In July, 2014, Twitter announced that it intends to buy a young company called CardSpring for an undisclosed sum. CardSpring enables retailers to offer online shoppers coupons that they can automatically sync to their credit cards in order to receive discounts when they shop in physical stores.[67]

On July 31, 2014, Twitter announced that it has acquired a small password-security startup called Mitro.[68]

On October 29, 2014, Twitter announced a new partnership with IBM. The partnership is intended to help businesses use Twitter data to understand their customers, businesses and other trends.[69]

Initial public offering (IPO)


Twitter's San Francisco, California headquarters, as seen from a corner on Market Street

On September 12, 2013, Twitter announced that it had filed papers with the U.S. Securities and 
Exchange Commission ahead of a planned stock market listing.[70] It revealed its prospectus in an 800-page filing.[71] Twitter planned to raise US$1 billion as the basis for its stock market debut.[72] The IPO filing states that "200,000,000+ monthly active users" access Twitter and "500,000,000+ tweets per day" are posted.[26][73]

In an October 15, 2013 amendment to their SEC S-1 filing,[74] Twitter declared that they would list on the New York Stock Exchange (NYSE), quashing speculation that their stock would trade on the NASDAQ exchange. This decision was widely viewed to be a reaction to the botched initial public offering of Facebook.[75] On November 6, 2013, 70 million shares[76] were priced at US$26 and issued by lead underwriter Goldman Sachs.[77]

On November 7, 2013, the first day of trading on the NYSE, Twitter shares opened at $26.00 and closed at US$44.90, giving the company a valuation of around US$31 billion.[78] This was $18.90 above the initial offering price and Twitter ended with a market capitalization of $24.46 billion.[79] The paperwork from November 7 shows that among the founders, Williams received a sum of US$2.56 billion and Dorsey received US$1.05 billion, while Costolo's payment was US$345 million.[80]

As of 13 December 2013, Twitter had "a market capitalization of $32.76 billion".[79]
On February 5, 2014, Twitter published its first results as a public company, showing a net loss of $511 million in the fourth quarter of 2013.[81]

Leadership

As chief executive officer, Dorsey saw the startup through two rounds of capital funding by the venture capitalists who backed the company.[82]

On October 16, 2008,[83] Williams took over the role of CEO, and Dorsey became chairman of the board.[84]

On October 4, 2010, Williams announced that he was stepping down as CEO. Dick Costolo, formerly Twitter's chief operating officer, became CEO. On October 4, 2010, Williams made an announcement saying that he will stay with the company and "be completely focused on product strategy."[85][86]

According to The New York Times, "Mr. Dorsey and Mr. Costolo forged a close relationship" when Williams was away.[87] According to PC Magazine, Williams was "no longer involved in the day-to-day goings on at the company". He was focused on developing a new startup, and became a member of Twitter's board of directors, and promised to "help in any way I can". In 2011, Stone was still with Twitter but was working with AOL as an "advisor on volunteer efforts and philanthropy".[88] In January 2014 Stone announced the release of Jelly, a 'social Q&A network for mobile'.[89]

Dorsey rejoined Twitter in March 2011, as executive chairman focusing on product development. At that time he split his schedule with Square (where he is CEO), whose offices are within walking distance of Twitter's in San Francisco.[87]

In September 2011, board members and investors Fred Wilson and Bijan Sabet resigned from Twitter's Board of Directors.[90]

In October 2012, Twitter announced it had hired former Google executive Matt Derella to become their new director of business agency development.[91]


July 15, 2006–September 14, 2010.

September 14, 2010–June 5, 2012.

Twitter has become internationally identifiable by its signature bird logo. The original logo was in use from its launch in March 2006 until September 2010. A slightly modified version succeeded the first style when the website underwent its first redesign.

On February 27, 2012, a tweet from an employee that works on the company's platform and API discussed the evolution of the "Larry the Bird" logo with Twitter's creative director and it was revealed that it was named after Larry Bird of the NBA's Boston Celtics fame. This detail had previously been confirmed when the Boston Celtics' director of interactive media asked Twitter co-founder Biz Stone about it in August 2011.[92]

June 5, 2012–present.

On June 5, 2012, Twitter unveiled its third logo redesign, replacing Larry the Bird with an updated icon simply named as the "Twitter Bird." As of this logo revision, the word "Twitter" and the lowercase letter "t" are no longer used, with the bird becoming the sole symbol for the company's branding.[93] According to Douglas Bowman, designer of Twitter, the new logo resembles a Mountain Bluebird.[94] Twitter explains on their website not to modify the logo (e.g. rotate the bird, change the logo's color, etc.).[95]

Features

Tweets


The Twitter account page for Wikipedia, demonstrating the account-customized timeline view which shows tweets in reverse chronological order

Tweets are publicly visible by default, but senders can restrict message delivery to just their followers. Users can tweet via the Twitter website, compatible external applications (such as for smartphones), or by Short Message Service (SMS) available in certain countries.[96] Retweeting is when a tweet is forwarded via Twitter by users. Both tweets and retweets can be tracked to see which ones are most popular. While the service is free, accessing it through SMS may incur phone service provider fees.[97]

Users may subscribe to other users' tweets – this is known as "following" and subscribers are known as "followers"[98] or "tweeps", a portmanteau of Twitter and peeps.[99] Users can check the people who are unsubscribing them on Twitter ("unfollowing") via various services.[100][101] In addition, users can block those who have followed them.

Twitter allows users to update their profile via their mobile phone either by text messaging or by apps released for certain smartphones and tablets.[102]

Twitter has been compared to a web-based Internet Relay Chat (IRC) client.[103] In a 2009 Time essay, technology author Steven Johnson described the basic mechanics of Twitter as "remarkably simple":[104]
As a social network, Twitter revolves around the principle of followers. When you choose to follow another Twitter user, that user's tweets appear in reverse chronological order on your main Twitter page. If you follow 20 people, you'll see a mix of tweets scrolling down the page: breakfast-cereal updates, interesting new links, music recommendations, even musings on the future of education.
According to research published in April 2014, around 44 percent of user accounts have never tweeted.[105]

Content


Content of tweets according to Pear Analytics
  News (3.6%)
  Spam (3.8%)
  Self-promotion (5.9%)
  Pointless babble (40.1%)
  Conversational (37.6%)
  Pass-along value (8.7%)

San Antonio-based market-research firm Pear Analytics analyzed 2,000 tweets (originating from the United States and in English) over a two-week period in August 2009 from 11:00 am to 5:00 pm (CST) and separated them into six categories:[106]
  • Pointless babble – 40%
  • Conversational – 38%
  • Pass-along value – 9%
  • Self-promotion – 6%
  • Spam – 4%
  • News – 4%
Despite Jack Dorsey's own open contention that a message on Twitter is "a short burst of inconsequential information", social networking researcher danah boyd responded to the Pear Analytics survey by arguing that what the Pear researchers labelled "pointless babble" is better characterized as "social grooming" and/or "peripheral awareness" (which she justifies as persons "want[ing] to know what the people around them are thinking and doing and feeling, even when co-presence isn't viable").[107] Similarly, a survey of Twitter users found that a more specific social role of passing along messages that include a hyperlink is an expectation of reciprocal linking by followers.[108]

Format

Users can group posts together by topic or type by use of hashtags – words or phrases prefixed with a "#" sign. Similarly, the "@" sign followed by a username is used for mentioning or replying to other users.[109] To repost a message from another Twitter user and share it with one's own followers, a user can click the retweet button within the Tweet.

In late 2009, the "Twitter Lists" feature was added, making it possible for users to follow (as well as mention and reply to) ad hoc lists of authors instead of individual authors.[98][110]

Through SMS, users can communicate with Twitter through five gateway numbers: short codes for the United States, Canada, India, New Zealand, and an Isle of Man-based number for international use. There is also a short code in the United Kingdom which is only accessible to those on the Vodafone, O2[111] and Orange[112] networks. In India, since Twitter only supports tweets from Bharti Airtel,[113] an alternative platform called smsTweet[114] was set up by a user to work on all networks.[115] A similar platform called GladlyCast exists for mobile phone users in Singapore, Malaysia, and the Philippines.[116]

The tweets were set to a largely constrictive 140-character limit for compatibility with SMS messaging, introducing the shorthand notation and slang commonly used in SMS messages. The 140-character limit has also increased the usage of URL shortening services such as bit.ly, goo.gl, and tr.im, and content-hosting services, such as Twitpic, memozu.com and NotePub to accommodate multimedia content and text longer than 140 characters. Since June 2011, Twitter has used its own t.co domain for automatic shortening of all URLs posted on its website.[117][118]

Trending topics


Countries and cities with local trending topics in Twitter.

A word, phrase or topic that is tagged at a greater rate than other tags is said to be a "trending topic". Trending topics become popular either through a concerted effort by users, or because of an event that prompts people to talk about a specific topic.[119] These topics help Twitter and their users to understand what is happening in the world.[120]

Trending topics are sometimes the result of concerted efforts and manipulations by preteen and teenaged fans of certain celebrities or cultural phenomena, particularly musicians like Lady Gaga (known as Little Monsters), Justin Bieber (Beliebers), and One Direction (Directioners), and fans of the Twilight (Twihards), Rihanna fans (Rih Navy), and Harry Potter (Potterheads) novels. Twitter has altered the trend algorithm in the past to prevent manipulation of this type to limited success.[121]

Twitter's March 30, 2010 blog post announced that the hottest Twitter trending topics would scroll across the Twitter homepage.[122]

There have been controversies surrounding Twitter trending topics: Twitter has censored hashtags that other users found offensive. Twitter censored the #Thatsafrican[123] and the #thingsdarkiessay hashtags after users complained that they found the hashtags offensive.[124] There are allegations that Twitter removed #NaMOinHyd from the trending list and added an Indian National Congress-sponsored hashtag.[125]

Adding and following content

There are numerous tools for adding content, monitoring content and conversations including Telly (video sharing, old name is Twitvid),[126] TweetDeck, Salesforce.com, HootSuite, and Twitterfeed.
As of 2009, fewer than half of tweets were posted using the web user interface with most users using third-party applications (based on analysis of 500 million tweets by Sysomos).[127]

Verified accounts

A verified Twitter account formally validates the identity of the person or company that owns the account—the aim of the "verified" status is to prevent impersonation through the placement of a small blue checkmark by the top-right corner of a user's page, or next to the username in the platform's Search function.[128] Twitter is responsible for assigning the blue checkmark, and it is frequently applied to the accounts of notable people in politics, music, movies, business, fashion, government, sports, media, and journalism.[129]

The owners of verified accounts can also access additional features that are not available to standard Twitter-account holders.[130] These features include the following:
  1. The ability to choose how their notifications and mentions are presented. Since verified accounts typically receive a lot of followers, account holders can filter these notices based on whether or not they are from verified accounts.[131]
  2. The ability to view information about their followers and their involvement on Twitter.
  3. The ability to receive direct messages from all followers or only selected followers.
  4. In a breach of Twitter's rules, some users placed the verified checkmark in their background—Twitter confirmed that such conduct is invalid. Following a design update of the Twitter platform, it is more difficult for users to impersonate a verified account because of the layout.[132]

Mobile


The mobile version of Twitter, mobile.twitter.com

Twitter has mobile apps for iPhone, iPad, Android, Windows Phone, BlackBerry, Firefox OS, and Nokia S40.[133] There is also version of the website for mobile devices, SMS and MMS service.[134] Twitter limits the use of third party applications utilizing the service by implementing a 100,000 user limit.[135]

Authentication

As of August 31, 2010, third-party Twitter applications are required to use OAuth, an authentication method that does not require users to enter their password into the authenticating application.
Previously, the OAuth authentication method was optional, it is now compulsory and the user-name/password authentication method has been made redundant and is no longer functional. Twitter stated that the move to OAuth will mean "increased security and a better experience".[136]

Related headlines feature

This feature adds websites to the bottom of a tweet's permalink page. If a website embedded a tweet onto one of their stories, the tweet will show the websites that mentioned the tweet. This feature was added onto Twitter so if the viewer doesn't understand what the tweet means, they can click on the sites to read more about what the person is talking about.[137]

Usage

Rankings

Twitter is ranked as one of the ten-most-visited websites worldwide by Alexa's web traffic analysis.[138] Daily user estimates vary as the company does not publish statistics on active accounts.
A February 2009 Compete.com blog entry ranked Twitter as the third most used social network based on their count of 6 million unique monthly visitors and 55 million monthly visits.[139] In March 2009, a Nielsen.com blog ranked Twitter as the fastest-growing website in the Member Communities category for February 2009. Twitter had annual growth of 1,382 percent, increasing from 475,000 unique visitors in February 2008 to 7 million in February 2009.[140] In 2009, Twitter had a monthly user retention rate of forty percent.[141]

Demographics

Twitter.com Top5 Global Markets by Reach (%)[142][143]
Country Percent
Indonesia Jun 2010
  
20.8%
Dec 2010
  
19.0%
Brazil Jun 2010
  
20.5%
Dec 2010
  
21.8%
Venezuela Jun 2010
  
19.0%
Dec 2010
  
21.1%
Netherlands Jun 2010
  
17.7%
Dec 2010
  
22.3%
Japan Jun 2010
  
16.8%
Dec 2010
  
20.0%
Note: Visitor age 15+, home and work locations. Excludes visitation from public computers such as Internet cafes or access from mobile phones or PDAs.

In 2009, Twitter was mainly used by older adults who might not have used other social sites before Twitter, said Jeremiah Owyang, an industry analyst studying social media. "Adults are just catching up to what teens have been doing for years," he said.[144] According to comScore only eleven percent of Twitter's users are aged twelve to seventeen.[144] comScore attributed this to Twitter's "early adopter period" when the social network first gained popularity in business settings and news outlets attracting primarily older users. However, comScore also stated in 2009 that Twitter had begun to "filter more into the mainstream", and "along with it came a culture of celebrity as Shaq, Britney Spears and Ashton Kutcher joined the ranks of the Twitterati."[145]

According to a study by Sysomos in June 2009, women make up a slightly larger Twitter demographic than men — fifty-three percent over forty-seven percent. It also stated that five percent of users accounted for seventy-five percent of all activity, and that New York City has more Twitter users than other cities.[146]

According to Quancast, twenty-seven million people in the US used Twitter as of September 3, 2009. Sixty-three percent of Twitter users are under thirty-five years old; sixty percent of Twitter users are Caucasian, but a higher than average (compared to other Internet properties) are African American/black (sixteen percent) and Hispanic (eleven percent); fifty-eight percent of Twitter users have a total household income of at least US$60,000.[147] The prevalence of African American Twitter usage and in many popular hashtags has been the subject of research studies.[148][149]

On September 7, 2011, Twitter announced that it has 100 million active users logging in at least once a month and 50 million active users every day.[150]

In an article published on January 6, 2012, Twitter was confirmed to be the biggest social media network in Japan, with Facebook following closely in second. comScore confirmed this, stating that Japan is the only country in the world where Twitter leads Facebook.[151]

On March 31, 2014, Twitter announced there were 255 million monthly active users (MAUs) and 198 million mobile MAUs.[152] In 2013, there were over 100 million users actively using Twitter daily and about 500 million Tweets every day,[153] with about 29% of users checking Twitter multiple times a day.[154]

In 2012, the country with the most active users on Twitter was the United States.[155]

Finances

Funding


Twitter's San Francisco headquarters located at 1355 Market St.

Twitter raised over US$57 million from venture capitalist growth funding, although exact numbers are not publicly disclosed. Twitter's first A round of funding was for an undisclosed amount that is rumored to have been between US$1 million and US$5 million.[156] Its second B round of funding in 2008 was for US$22 million[157] and its third C round of funding in 2009 was for US$35 million from Institutional Venture Partners and Benchmark Capital along with an undisclosed amount from other investors including Union Square Ventures, Spark Capital, and Insight Venture Partners.[156] Twitter is backed by Union Square Ventures, Digital Garage, Spark Capital, and Bezos Expeditions.[158]

In May 2008, The Industry Standard remarked that Twitter's long-term viability is limited by a lack of revenue.[159] Twitter board member Todd Chaffee forecast that the company could profit from e-commerce, noting that users may want to buy items directly from Twitter since it already provides product recommendations and promotions.[160]

By March 2009 communications consultant Bill Douglass predicted in an interview that Twitter would be worth $1 billion within six months,[161] which came to pass when the company closed a financing round valuing it at $1 billion in September of that year.[162]

The company raised US$200 million in new venture capital in December 2010, at a valuation of approximately US$3.7 billion.[163] In March 2011, 35,000 Twitter shares sold for US$34.50 each on Sharespost, an implied valuation of US$7.8 billion.[164] In August, 2010 Twitter announced a "significant" investment lead by Digital Sky Technologies that, at US$800 million, was reported to be the largest venture round in history.[165]

In December 2011, the Saudi prince Alwaleed bin Talal invested $300 million in Twitter. The company was valued at $8.4 billion at the time.[166]

Revenue sources

In July 2009, some of Twitter's revenue and user growth documents were published on TechCrunch after being illegally obtained by Hacker Croll. The documents projected 2009 revenues of US$400,000 in the third quarter and US$4 million in the fourth quarter along with 25 million users by the end of the year. The projections for the end of 2013 were US$1.54 billion in revenue, US$111 million in net earnings, and 1 billion users.[167] No information about how Twitter planned to achieve those numbers was published. In response, Twitter co-founder Biz Stone published a blog post suggesting the possibility of legal action against the hacker.[168]

On April 13, 2010, Twitter announced plans to offer paid advertising for companies that would be able to purchase "promoted tweets" to appear in selective search results on the Twitter website, similar to Google Adwords' advertising model. As of April 13, Twitter announced it had already signed up a number of companies wishing to advertise, including Sony Pictures, Red Bull, Best Buy, and Starbucks.[169][170]

The company generated US$45 million in annual revenue in 2010, after beginning sales midway through that year; the company operated at a loss through most of 2010.[163]

Users' photos can generate royalty-free revenue for Twitter, and an agreement with World Entertainment News Network (WENN) was announced in May 2011.[171] In June 2011, Twitter announced that it would offer small businesses a self-service advertising system.[172] Twitter generated US$139.5 million in advertising sales during 2011.

The self-service advertising platform was launched in March 2012 to American Express card members and merchants in the U.S. on an invite-only basis. Twitter later reported that numerous small businesses and people who used the self-service tool provided feedback that indicated they were impressed by the feature.[173] To continue their advertising campaign, Twitter announced on March 20, 2012 that promoted tweets would be introduced to mobile devices.[174] In April 2013, Twitter announced that its Twitter Ads self-service platform, consisting of promoted tweets and promoted accounts, was available to all U.S. users without an invite.[173]

Twitter's financial revenue statistics for the first quarter of 2014 was reported as US$250 million.[152]

Technology

Implementation

Twitter places great reliance on open-source software.[175] The Twitter Web interface uses the Ruby on Rails framework,[176] deployed on a performance enhanced Ruby Enterprise Edition implementation of Ruby.[177]

In the early days of Twitter, tweets were stored in MySQL databases that were temporally sharded, that is the databases were split by time of posting. MySQL was causing problems with both reading and writing to Twitter and the company decided that the system needed re-engineering.[178]
As of April 6, 2011, Twitter engineers confirmed they had switched away from their Ruby on Rails search stack, to a Java server they call Blender.[6]

From Spring 2007 to 2008 the messages were handled by a Ruby persistent queue server called Starling,[179] but since 2009 implementation has been gradually replaced with software written in Scala.[180] The switch from Ruby to Scala and the JVM has given Twitter a performance boost from 200—300 requests per second per host to around 10,000–20,000 requests per second per host. This boost was greater than the 10x improvement that Twitter's engineers envisioned when starting the switch. The continued development of Twitter has also involved a switch from monolithic development of a single app to an architecture where different services are built independently and joined through remote procedure calls.[178]

The service's application programming interface (API) allows other web services and applications to integrate with Twitter.[181][182]

Individual tweets are registered under unique IDs using software called snowflake and geolocation data is added using 'Rockdove'. The URL shortner t.co then checks for a spam link and shortens the URL. The tweets are stored in a MySQL database using Gizzard and acknowledged to users as having been sent. They are then sent to search engines via the Firehose API. The process itself is managed by FlockDB and takes an average of 350 ms.[175]

On August 16, 2013, Twitter's Vice President of Platform Engineering Raffi Krikorian shared in a blog post that the company's infrastructure handled almost 143,000 tweets per second during that week, setting a new record. Krikorian explained that Twitter achieved this record by blending its homegrown and open source technologies.[178][183]

Interface

On April 30, 2009, Twitter adjusted its web interface, adding a search bar and a sidebar of "trending topics" — the most common phrases appearing in messages. Biz Stone explains that all messages are instantly indexed and that "with this newly launched feature, Twitter has become something unexpectedly important – a discovery engine for finding out what is happening right now."[184]

In March 2012, Twitter became available in Arabic, Farsi, Hebrew and Urdu, the first right-to-left language versions of the site. About 13,000 volunteers helped with translating the menu options.[185] In August 2012, beta support for Basque, Czech and Greek was added, making the site available in 33 different languages.[186]

Outages


The Twitter fail whale error message.

When Twitter experiences an outage, users once saw the "fail whale" error message image created by Yiying Lu,[187] illustrating eight orange birds using a net to hoist a whale from the ocean captioned "Too many tweets! Please wait a moment and try again.".[188] In a November 2013 WIRED interview Chris Fry, VP of Engineering at that time, noted that the company had taken the "fail whale" out of production as the platform was now more stable.

Twitter had approximately ninety-eight percent uptime in 2007 (or about six full days of downtime).[189] The downtime was particularly noticeable during events popular with the technology industry such as the 2008 Macworld Conference & Expo keynote address.[190][191]
  • May 2008 – Twitter's new engineering team made architectural changes to deal with the scale of growth. Stability issues resulted in down time or temporary feature removal.
  • August 2008 – Twitter withdrew free SMS services from users in the United Kingdom[192] and for approximately five months instant messaging support via a XMPP bot was listed as being "temporarily unavailable".[193]
  • October 10, 2008 – Twitter's status blog announced that instant messaging (IM) service was no longer a temporary outage and needed to be revamped. It was announced that Twitter aims to return its IM service pending necessary major work.[194]
  • June 12, 2009 – In what was called a potential "Twitpocalypse", the unique numerical identifier associated with each tweet exceeded the limit of 32-bit signed integers (2,147,483,647 total messages).[195] While Twitter itself was not affected, some third-party clients could no longer access recent tweets. Patches were quickly released, though some iPhone applications had to wait for approval from the App Store.[196]
  • June 25, 2009 – Twitter ran slowly for some time after over 50,000 tweets on Michael Jackson's death were recorded in an hour.[197]
  • August 6, 2009 – Twitter and Facebook suffered from a denial-of-service attack, causing the Twitter website to go offline for several hours.[198] It was later confirmed that the attacks were directed at one pro-Georgian user around the anniversary of the 2008 South Ossetia War, rather than the sites themselves.[199]
  • September 22, 2009 – The identifier exceeded the limit for 32-bit unsigned integers (4,294,967,296 total messages) again breaking some third-party clients.[200]
  • December 17, 2009 – A hacking attack replaced the website's welcoming screen with an image of a green flag and the caption "This site has been hacked by Iranian Cyber Army" for nearly an hour. No connection between the hackers and Iran has been established.[201]
  • June–July 2010 – Twitter had a very high service rejection rate (10–20%) during the 2010 FIFA World Cup period, also, the response latency increased substantially.[202]
  • November 2010 – A number of accounts encountered a fault that resulted in them seeing the "fail whale" when they tried to login to their accounts. The accounts themselves were not locked out as account holders could still see their "mentions" page, and post from there, but the timeline and a number of other features were unavailable during this outage.
  • June 21, 2012 – The site was down for around one hour and forty minutes, with the cause being described by Twitter as a "cascading bug".[203]
  • July 26, 2012 – Twitter users in the UK could not post messages for part of the day in advance of the 2012 Summer Olympics.[204]
  • March 2, 2014 - During the 86th Academy Awards, Ellen DeGeneres posted a selfie of herself and other celebrities as seen on the telecast, which shut down Twitter for more than 20 minutes.[205]

Privacy and security

Twitter messages are public but users can also send private messages.[206] Twitter collects personally identifiable information about its users and shares it with third parties. The service reserves the right to sell this information as an asset if the company changes hands.[207] While Twitter displays no advertising, advertisers can target users based on their history of tweets and may quote tweets in ads[208] directed specifically to the user.

A security vulnerability was reported on April 7, 2007, by Nitesh Dhanjani and Rujith. Since Twitter used the phone number of the sender of an SMS message as authentication, malicious users could update someone else's status page by using SMS spoofing.[209] The vulnerability could be used if the spoofer knew the phone number registered to their victim's account. Within a few weeks of this discovery Twitter introduced an optional personal identification number (PIN) that its users could use to authenticate their SMS-originating messages.[210]

On January 5, 2009, 33 high-profile Twitter accounts were compromised after a Twitter administrator's password was guessed by a dictionary attack.[211] Falsified tweets — including sexually explicit and drug-related messages — were sent from these accounts.[212]

Twitter launched the beta version of their "Verified Accounts" service on June 11, 2009, allowing famous or notable people to announce their Twitter account name. The home pages of these accounts display a badge indicating their status.[213]

In May 2010, a bug was discovered by İnci Sözlük, involving users that allowed Twitter users to force others to follow them without the other users' consent or knowledge. For example, comedian Conan O'Brien's account, which had been set to follow only one person, was changed to receive nearly 200 malicious subscriptions.[214]

In response to Twitter's security breaches, the US Federal Trade Commission brought charges against the service which were settled on June 24, 2010. This was the first time the FTC had taken action against a social network for security lapses. The settlement requires Twitter to take a number of steps to secure users' private information, including maintenance of a "comprehensive information security program" to be independently audited biannually.[215]

On December 14, 2010, the United States Department of Justice issued a subpoena directing Twitter to provide information for accounts registered to or associated with WikiLeaks.[216] Twitter decided to notify its users and said in a statement, "...it's our policy to notify users about law enforcement and governmental requests for their information, unless we are prevented by law from doing so".[206]

A "MouseOver" exploit occurred on September 21, 2010, when an XSS Worm became active on Twitter. When an account user held the mouse cursor over blacked-out parts of a tweet, the worm within the script would automatically open links and re-post itself on the reader's account.[217] The exploit was then re-used to post pop-up ads and links to pornographic sites. The origin is unclear but Pearce H. Delphin (known on Twitter as @zzap) and a Scandinavian developer, Magnus Holm, both claim to have modified the exploit of a user, possibly Masato Kinugawa, who was using it to create coloured Tweets.[218] Kinugawa, a Japanese developer, reported the XSS vulnerability to Twitter on August 14. Later, when he found it was exploitable again, he created the account 'RainbowTwtr' and used it to post coloured messages.[218] Delphin says he exposed the security flaw by tweeting a JavaScript function for "onMouseOver",[218] and Holm later created and posted the XSS Worm that automatically re-tweeted itself.[217] Security firm Sophos reported that the virus was spread by people doing it for "fun and games", but noted it could be exploited by cybercriminals.[217] Twitter issued a statement on their status blog at 13:50 UTC that "The exploit is fully patched".[217][219] Twitter representative Carolyn Penner said no charges would be pressed.[220]

In May 2011, a claimant known as "CTB" (subsequently identified as Ryan Giggs) in the case of CTB v Twitter Inc., Persons Unknown took legal action at the High Court of Justice in London against Twitter,[221] requesting that Twitter release details of account holders. This followed gossip posted on Twitter about Giggs' private life, causing conflict relating to privacy injunctions.[222][223] Tony Wang, the head of Twitter in Europe, said that people who do "bad things" on the site would need to defend themselves under the laws of their own jurisdiction in the event of controversy, and that the site would hand over information about users to the authorities when it was legally required to do so.[224] He also suggested that Twitter would accede to a UK court order to divulge names of users responsible for "illegal activity" on the site.[225]

On May 29, 2011, it was reported that South Tyneside council in England had successfully taken legal action against Twitter in a court in California, which forced Twitter to reveal the details of five user accounts. The council was trying to discover the identity of a blogger called "Mr Monkey"[226] who allegedly posted libellous statements about three local councillors.[227]

On January 23, 2012, it was reported that Twitter would be acquiring Dasient, a startup that offers malware protection for businesses. Twitter hopes that Dasient will help remove hateful advertisers on the website.[228]

On January 26, 2012, Twitter began offering a feature which would allow tweets to be removed selectively by country. Twitter cited France and Germany as examples, where pro-Nazi content is illegal. Previously, deleted tweets were removed in all countries.[229][230] The first use of the policy was to block the account of German neo-Nazi group Besseres Hannover on October 18, 2012.[231] The policy was used again the following day to remove anti-Semitic French tweets with the hashtag #unbonjuif ("a good Jew").[232]

On February 20, 2012, a third-party public-key encryption app (written in Python and partially funded by a grant from the Shuttleworth Foundation[233]) for private messaging in Twitter, CrypTweet, was released.[234]

On May 17, 2012, Twitter announced it would implement the "Do Not Track" privacy option, a cookie-blocking feature found in Mozilla's Firefox browser. The "Do Not Track" feature works only on sites that have agreed to the service.[235]

In August 2012 it was reported that there is a market in fake Twitter followers that are used to increase politicians' and celebrities' apparent popularity.[236] The black market for the fake followers, known as "bots", has been linked to "nearly every politically linked account from the White House to Congress to the 2016 campaign trail." In June 2014, POLITICO analyzed Twitter handles with the highest rates of fake followers: US President Barack Obama with 46.8 percent, Democratic National Committee Chairwoman Debbie Wasserman Schultz with 35.1 percent, and Senator John McCain with 23.6 percent. The culprits working to generate the fake followers, or "bots", include campaign workers or friends of political candidates. One site offers 1,000 fake followers for $20. The people creating the "bots" are often from Eastern Europe and Asia.[237][238] In 2013, two Italian researchers calculated 10 percent of total accounts on Twitter are "bots" however, other estimates have placed the figure even higher.[239]

In April 2013 Twitter warned news organizations around the world to secure their Twitter accounts after a number of high profile hacks of official accounts including those of the Associated Press and The Guardian.[240] In May 2013, Twitter announced a two-factor login verification as an added measure against hacking.[241]

In August 2013, Twitter announced plans to introduce a "report abuse" button for all versions of the site. A petition for making the process of complaining about harassment easier had collected over 100,000 signatures. The move followed the posting of abusive tweets, including rape and death threats to historian Mary Beard, British feminist campaigner Caroline Criado-Perez and the British MP Stella Creasy.[242][243][244] Three men were arrested under the Protection from Harassment Act 1997 in connection with the incidents.[245]

In August 2014, Twitter said that in certain cases it would delete pictures of people who had died after requests from family members and "authorized individuals". The move followed controversy over the sharing of images on Twitter showing the killing of American journalist James Foley.[246][247]

On December 2014 Twitter announced new reporting and blocking policies;[248][249][250][251] a blocking mechanism devised by a target of GamerGate also received notable coverage.[252][253][254]

In February 2015, in an internal Twitter memo, CEO Dick Costolo said he was 'frankly ashamed' at how poorly Twitter handled trolling and abuse, and admitted Twitter had lost users as a result.[255]

Open source

Twitter has a history of both using and releasing open source software while overcoming technical challenges of their service.[256] A page in their developer documentation thanks dozens of open source projects which they have used, from revision control software like Git to programming languages such as Ruby and Scala.[257] Software released as open source by the company includes the Gizzard Scala framework for creating distributed datastores, the distributed graph database FlockDB, the Finagle library for building asynchronous RPC servers and clients, the TwUI user interface framework for iOS, and the Bower client-side package manager.[258][259] The popular Twitter Bootstrap web design library was also started at Twitter and is the most popular repository on GitHub.[260]

Innovators patent agreement

On April 17, 2012, Twitter announced it would implement an "Innovators Patent Agreement" which would obligate Twitter to only use its patents for defensive purposes. The agreement went into effect in 2012.[261]

URL shortener

t.co is a URL shortening service created by Twitter.[117] It is only available for links posted to Twitter and not available for general use.[117] All links posted to Twitter use a t.co wrapper.[262] Twitter hopes that the service will be able to protect users from malicious sites,[117] and will use it to track clicks on links within tweets.[117][263]

Having previously used the services of third parties TinyURL and bit.ly,[264] Twitter began experimenting with its own URL shortening service for private messages in March 2010 using the twt.tl domain,[262] before it purchased the t.co domain. The service was tested on the main site using the accounts @TwitterAPI, @rsarver and @raffi.[262] On September 2, 2010, an email from Twitter to users said they would be expanding the roll-out of the service to users. On June 7, 2011, Twitter announced that it was rolling out the feature.[118]

Integrated photo-sharing service

On June 1, 2011, Twitter announced its own integrated photo-sharing service that enables users to upload a photo and attach it to a Tweet right from Twitter.com.[265] Users now also have the ability to add pictures to Twitter's search by adding hashtags to the tweet.[266] Twitter also plans to provide photo galleries designed to gather and syndicate all photos that a user has uploaded on Twitter and third-party services such as TwitPic.[266]

Twitterbots

A Twitterbot is a computer program that automatically posts on Twitter, they are programmed to tweet, retweet, and follow other accounts. According to a recent report, there were 20 million, fewer than 5%, of accounts on Twitter that were fraudulent in 2013. These fake accounts are often used to build large follower populations quickly for advertisers, while others respond to tweets that include a certain word or phrase.[267] These 'bots' embody the automation of modern life as they connect directly to Twitter's mainline computing the information they intake and posting on a whim. Twitter's wide-open application programming interface and cloud servers make it possible for twitterbots' existence within the social networking site.[268]

Society


Dorsey (left) said after a Twitter Town Hall with Barack Obama held in July 2011, that Twitter received over 110,000 #AskObama tweets.[269]

Issues and controversies

Twitter has been used for a variety of purposes in many industries and scenarios. For example, it has been used to organize protests, sometimes referred to as "Twitter Revolutions", which include the 2011 Egyptian revolution, 2010–2011 Tunisian protests, 2009–2010 Iranian election protests, and 2009 Moldova civil unrest.[270] The governments of Iran and Egypt blocked the service in retaliation.[271][272] The Hill on February 28, 2011 described Twitter and other social media as a "strategic weapon ... which have the apparent ability to re-align the social order in real time, with little or no advanced warning."[273] During the Arab Spring in early 2011, the number of hashtags mentioning the uprisings in Tunisia and Egypt increased.[274] A study by the Dubai School of Government found that only 0.26% of the Egyptian population, 0.1% of the Tunisian population and 0.04% of the Syrian population are active on Twitter.[275]

The service is also used as a form of civil disobedience: in 2010, users expressed outrage over the Twitter Joke Trial by making obvious jokes about terrorism;[276] and in the British privacy injunction debate in the same country a year later, where several celebrities who had taken out anonymised injunctions, most notably the Manchester United player Ryan Giggs, were identified by thousands of users in protest to traditional journalism being censored.[277]

Another, more real time and practical use for Twitter exists as an effective de facto emergency communication system for breaking news. It was neither intended nor designed for high performance communication, but the idea that it could be used for emergency communication certainly was not lost on the originators, who knew that the service could have wide-reaching effects early on when the San Francisco, California company used it to communicate during earthquakes.[278] The Boston Police tweeted news of the arrest of the 2013 Boston Marathon Bombing suspect.[279] Another practical use that is being studied is Twitter's ability to track epidemics and how they spread.[280] In addition, Twitter has acted as a sensor for automatic response to natural disasters such as bush fires.[281][282]

Twitter has been used by Somalia's al-Shabaab rebels, who had their accounts suspended after they used the site to claim responsibility for an attack on the Westgate Shopping Mall in Nairobi in September 2013.[283][284]

Censorship of Twitter

Twitter has been blocked intermittently in numerous countries including China, Iran, Iraq, Egypt, Venezuelan, Turkey on different bases.[285][286][287][288]

Impact

Instant and frequent communication

In May 2008, The Wall Street Journal wrote that social networking services such as Twitter "elicit mixed feelings in the technology-savvy people who have been their early adopters. Fans say they are a good way to keep in touch with busy friends. But some users are starting to feel 'too' connected, as they grapple with check-in messages at odd hours, higher cellphone bills and the need to tell acquaintances to stop announcing what they're having for dinner."[289]

Education

Twitter has been adopted as a communication and learning tool in educational settings mostly in colleges and universities.[290][291] It has been used as a backchannel to promote student interactions, especially in large-lecture courses.[292] Research has found that using Twitter in college courses helps students communicate with each other and faculty, promotes informal learning, allows shy students a forum for increased participation, increases student engagement, and improves overall course grades.[293][294][295]

Public figures

Tech writer Bruce Sterling commented in 2007 that using Twitter for "literate communication" is "about as likely as firing up a CB radio and hearing some guy recite the Iliad".[296] In September 2008, the journalist Clive Thompson mused in a The New York Times Magazine editorial that the service had expanded narcissism into "a new, supermetabolic extreme—the ultimate expression of a generation of celebrity-addled youths who believe their every utterance is fascinating and ought to be shared with the world."[297] One of the earliest documented forms of celebrity related twitter-like disclosures dates from 1980, when real estate mogul William Desmond Ryan made round the clock press releases about his relationship with comedienne Phyllis Diller, even revealing what she was making him for dinner on a nightly basis.[298] Conversely, Vancouver Sun columnist Steve Dotto opined that part of Twitter's appeal is the challenge of trying to publish such messages in tight constraints,[299] and Jonathan Zittrain, professor of Internet law at Harvard Law School, said that "the qualities that make Twitter seem inane and half-baked are what makes it so powerful".[300]

The novelist Rick Moody wrote a short story for Electric Literature called "Some Contemporary Characters," composed entirely of tweets.[301]

In 2009, Nielsen Online reported that Twitter has a user retention rate of forty percent. Many people stop using the service after a month, therefore the site may potentially reach only about ten percent of all Internet users.[302] In 2009, Twitter won the "Breakout of the Year" Webby Award.[303][304] During a February 2009 discussion on National Public Radio's Weekend Edition, the journalist Daniel Schorr stated that Twitter accounts of events lacked rigorous fact-checking and other editorial improvements. In response, Andy Carvin gave Schorr two examples of breaking news stories that played out on Twitter and said users wanted first-hand accounts and sometimes debunked stories.[305] On November 29, 2009 Twitter was named the Word of the Year by the Global Language Monitor, declaring it "a new form of social interaction".[306] Time magazine acknowledged its growing level of influence in its 2010 Time 100; to determine the influence of people, it used a formula based on famous social networking sites, Twitter and Facebook. The list ranges from Barack Obama and Oprah Winfrey to Lady Gaga and Ashton Kutcher.[307][308] The U.S. government, seeing social media's role in the 2010 Arab Spring revolts, covertly developed a Cuban alternative to Twitter called ZunZuneo as part of a long-term strategy to "stir unrest". The service was active from 2010 to 2012.[309]

During the 2012 Summer Olympics opening ceremony, in which he appeared at the London Olympic Stadium in person,[310] Sir Tim Berners-Lee, the founder of the World Wide Web, tweeted "This is for everyone",[311] which was instantly spelled out in LCD lights attached to the chairs of the 80,000 people in the audience.[310]
World leaders
World leaders and their diplomats have taken note of Twitter's rapid expansion and have been increasingly utilizing Twitter diplomacy, the use of Twitter to engage with foreign publics and their own citizens. US Ambassador to Russia, Michael A. McFaul has been attributed as a pioneer of international Twitter diplomacy. He used Twitter after becoming ambassador in 2011, posting in English and Russian.[312] On October 24, 2014, Queen Elizabeth II sent her first tweet to mark the opening of the London Science Museum's Information Age exhibition.[313] A 2013 study by website Twiplomacy found that 153 of the 193 countries represented at the United Nations had established government Twitter accounts.[314] The same study also found that those accounts amounted to 505 Twitter handles used by world leaders and their foreign ministers, with their tweets able to reach a combined audience of over 106 million followers.[314]

According to an analysis of accounts, the heads of state of 125 countries and 139 other leading politicians have Twitter accounts that have between them sent more than 350,000 tweets and have almost 52 million followers. However, only 30 of these do their own tweeting, more than 80 do not subscribe to other politicians and many do not follow any accounts.[315]

Religion

More than twenty Roman Catholic cardinals manage active Twitter accounts,[316] nine of whom were cardinal electors for the 2013 Papal conclave.[317]

Twitterbot effect

Twitterbots are capable of influencing public opinion about culture, products and political agendas by automatically generating mass amounts of tweets through imitating human communication.[318] The New York Times states, "They have sleep-wake cycles so their fakery is more convincing, making them less prone to repetitive patterns that flag them as mere programs".[319] The tweets generated vary anywhere from a simple automated response to content creation and information sharing, all of which depends on the intention of the person purchasing or creating the bot. The social implications these Twitterbots potentially have on human perception are sizeable according to a study published by the ScienceDirect Journal. Looking at the Computers as Social Actors (CASA) paradigm, the journal notes, "people exhibit remarkable social reactions to computers and other media, treating them as if they were real people or real places". The study concluded that Twitterbots were viewed as credible and competent in communication and interaction making them suitable for transmitting information in the social media sphere.[320] While the technological advances have enabled the ability of successful Human-Computer Interaction, the implications are questioned due to the appearance of both benign and malicious bots in the Twitter realm. Benign Twitterbots may generate creative content and relevant product updates whereas malicious bots can make unpopular people seem popular, push irrelevant products on users and spread misinformation, spam and/or slander.[321]

In addition to content generating bots, users can purchase followers, favorites, retweets and comments on various websites that cater to expanding a users image through accumulation of followers. With more followers, users' profiles gain more attention, thus increasing their popularity.[322] Generating Web traffic is a valuable commodity for both individuals and businesses because it indicates notability.[323] With Twitterbots, users are able to create the illusion of "buzz" on their site by obtaining followers from services such as Swenzy and underground suppliers who operate bot farms or click farms.[318][323] The companies that facilitate this service create fake Twitter accounts that follow a number of people, some of these Twitter accounts may even post fake tweets to make it seem like they are real. This practice of obtaining mass amounts of twitterbots as followers is not permitted on Twitter.[324] The emphasis on followers and likes as a measure of social capital has urged people to extend their circle to weak and latent ties to promote the idea of popularity for celebrities, politicians, musicians, public figures, and companies alike.[325] According to the New York Times, bots amass significant influence and have been noted to sway elections, influence the stock market, public appeal, and attack governments.[319]

Trending topics

After claims in the media that the hashtags #wikileaks and #occupywallstreet were being censored because they did not show up on the site's list of trending topics, Twitter responded by stating that it does not censor hashtags unless they contain obscenities.[326][327][328]

GCHQ

According to documents leaked by Edward Snowden and published in July 2014, the United Kingdom's GCHQ has a tool named BIRDSONG for "automated posting of Twitter updates", and a tool named BIRDSTRIKE for "Twitter monitoring and profile collection".[329][330]

Television

Twitter is also increasingly used for making TV more interactive and social.[331] This effect is sometimes referred to as the "virtual watercooler" or social television — the practice has been called "chatterboxing".[332] Twitter has been successfully used to encourage people to watch live TV events, such as the Oscars, the Super Bowl[333] and the MTV Video Music Awards; however this strategy has proven less effective with regularly scheduled TV shows.[334] Such direct cross-promotions have been banned from French television due to regulations against secret advertising.[335]

In December 2012, Twitter and Nielsen entered a multi-year agreement to produce social TV ratings, which are expected to be commercially available for the fall 2013 season as the Nielsen Twitter TV Rating.[336][337] Advertising Age said Twitter had become the new TV Guide.[338] Then in February 2013, Twitter acquired Bluefin Labs for an estimated US$50 million to $100 million, which was the company's largest acquisition as of 2013. Founded in 2008 at the MIT Media Lab, Bluefin is a data miner whose analysis tells which brands (e.g., TV shows and companies) are chatted about the most in social media.[336][337][339] MIT Technology Review said that Bluefin gives Twitter part of the US$72 billion television advertising market.[340]

In April 2013, the Associated Press' Twitter account was briefly hacked into, sending out a message that US president Barack Obama had been injured in an attack on the White House. Stocks lost $134 billion in value almost instantly, before recovering in value when it was discovered the report was false.[341]

In May 2013, it launched Twitter Amplify – an advertising product for media and consumer brands.[342] With Amplify, Twitter runs video highlights from major live broadcasts, with advertisers' names and messages playing before the clip.[343] Then in October 2013, Comcast announced a partnership with NBCUniversal and Twitter, to allow users to tune into live streaming from their set-top box, smartphone or tablet by tapping a 'See It' button embedded in selected tweets.[344]
in an attempt to compete with Twitter's leadership in TV, Facebook introduced a number of features in 2013 to drive conversation around TV including hashtags, verified profiles and embeddable posts.
It also opened up new data visualization APIs for TV news and other media outlets, enabling them to search for a word and see a firehose of public posts that mention it as well as show how many people mentioned a word in both public and private posts during a set time frame, with a demographic breakdown of the age, gender, and location of these people.[345] In January 2014, Facebook announced a partnership with UK-based social TV analytics company SecondSync which saw the social network make its social TV available outside the company for the first time. Facebook struck the partnership to help marketers understand how people are using the social network to talk about topics such as TV.[346] However, Twitter responded by acquiring SecondSync and Parisian social TV firm Mesagraph three months later. These acquisitions, as well as a partnership with research company Kantar (which it had been working with to develop a suite of analytics tools for the British TV industry since August 2013) strengthened Twitter's dominance of the "second screen" - TV viewers using tablets and smartphones to share their TV experience on social media. With the additional analytic tools, Twitter was able to improve the firm's offering to advertisers, allowing them to, for instance, only promote a tweet onto the timelines of users who were watching a certain programme.[347]

By February 2014, all four major U.S. TV networks had signed up to the Amplify program, bringing a variety of premium TV content onto the social platform in the form of in-tweet real-time video clips.[348] In March 2014, ITV became the first major broadcaster in the UK to sign up to Twitter Amplify[349] and Twitter introduced one-tap video playback across its mobile apps to further enhance the consumer experience.[344]

In June 2014, Twitter acquired its Twitter Amplify partner in the U.S., SnappyTV, as part of its ongoing efforts to be the leader in social television.[350] The company was helping broadcasters and rights holders to share video content both organically across social and via Twitter's Amplify program. In Europe Twitter's Amplify partner is London-based Grabyo, which has also struck numerous deals with broadcasters and rights holders[66] to share video content across Facebook and Twitter.[351]

Statistics

Most popular accounts

As of January 24, 2015, the Twitter accounts with the most followers were:[352]
  1. Katy Perry- 63,810,164 followers
  2. Justin Bieber- 59,563,491
  3. Barack Obama- 53,604,487
  4. Taylor Swift- 51,132,675
  5. YouTube- 48,336,985
  6. Lady Gaga- 43,767,701
  7. Justin Timberlake- 40,717,526
  8. Britney Spears- 40,492,723
  9. Rihanna- 39,639,895
  10. Ellen DeGeneres- 38,153,326

Oldest accounts

The oldest Twitter accounts are 14 accounts which became active on 21 March 2006, all belonging to Twitter employees at the time and including @jack (Jack Dorsey), @biz (Biz Stone) and @noah (Noah Glass).[353]

Record tweets

On February 3, 2013, Twitter announced that a record 24.1 million tweets were sent the night of Super Bowl XLVII.[354]

A selfie orchestrated by 86th Academy Awards host Ellen DeGeneres during the March 2, 2014 broadcast is the most retweeted image ever.[205][355] DeGeneres said she wanted to homage Meryl Streep's record 17 Oscar nominations by setting a new record with her, and invited other Oscar celebrities to join them. The resulting photo of twelve celebrities broke the previous retweet record within forty minutes, and was retweeted over 1.8 million times in the first hour.[356][357][358] By the end of the ceremony it had been retweeted over 2 million times, less than 24 hours later, it had been retweeted over 2.8 million times.[355][356] As of 18 March 2014, it has been retweeted over 3.4 million times.[355] The group selfie effort was parodied by Lego, and Matt Groening with The Simpsons.[359][360] It beat the previous record, 778,801, which was held by Barack Obama, following his victory in the 2012 presidential election.[358][361][362]

The most tweeted moment in the history of Twitter was during the airing of Castle in the Sky on August 2, 2013, when fans tweeted the word "balse" at the exact time that it played in the movie. There was a global peak of 143,199 tweets in one second, beating the previous record of 33,388.[363]

Future

Twitter emphasized its news and information-network strategy in November 2009 by changing the question asked to users for status updates from "What are you doing?" to "What's happening?"[364][365] On November 22, 2010, Biz Stone, a cofounder of the company, expressed for the first time the idea of a Twitter news network,[366] a concept of a wire-like news service he has been working on for years.[367]

Lie group

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Lie_group In mathematics , a Lie gro...