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Twitter is an online news and social networking service where users post and read short 140-character messages called "tweets". Registered users can post and read tweets, but those who are unregistered can only read them. Users access Twitter through the website interface, SMS or mobile device app. Twitter Inc. is based in San Francisco and has more than 25 offices around the world.

Twitter, Inc.
Twitter bird logo 2012.svg
Type of business Public
Type of site
News and social network service
Available in Multilingual
Traded as NYSETWTR
Founded March 21, 2006; 10 years ago (2006-03-21)
Headquarters San Francisco, California, U.S.
Coordinates 37°46′36″N 122°25′00″W / 37.7768°N 122.4166°W / 37.7768; -122.4166Coordinates: 37°46′36″N 122°25′00″W / 37.7768°N 122.4166°W / 37.7768; -122.4166
Area served Worldwide
Founder(s) Jack Dorsey
Noah Glass
Biz Stone
Evan Williams
Key people Omid Kordestani

Jack Dorsey
Industry Internet
Revenue Increase US$2.21 billion (2015)
Net income Increase US$-521 million (2015)
Employees 3,860 (June 2016)
Subsidiaries Vine
Periscope
Website twitter.com
Alexa rank Negative increase 10 (December 2016)
Registration Required to post, follow, or be followed
Users 313 million active users (June 2016)
Launched July 15, 2006 (2006-07-15)
Current status Active
Written in Java, Ruby, Scala, JavaScript

Twitter (/ˈtwɪtər/) is an online news and social networking service where users post and read short 140-character messages called "tweets". Registered users can post and read tweets, but those who are unregistered can only read them. Users access Twitter through the website interface, SMS or mobile device app. Twitter Inc. is based in San Francisco and has more than 25 offices around the world.

Twitter was created in March 2006 by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams and launched in July, whereby the service rapidly gained worldwide popularity. In 2012, more than 100 million users posted 340 million tweets a day, and the service handled an average of 1.6 billion search queries per day. In 2013, it was one of the ten most-visited websites and has been described as "the SMS of the Internet". As of March 2016, Twitter had more than 310 million monthly active users. On the day of the 2016 U.S. presidential election, Twitter proved to be the largest source of breaking news, with 40 million tweets sent by 10 p.m. (East Coast Time) that day.

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