Twitter

Current homepage of Twitter.
Type	Public
Traded as	NYSE: TWTR
Foundation date	March 21, 2006[
Headquarters	San Francisco, California,United States[
Area served	Worldwide
Founder(s)	Jack Dorsey, Noah Glass, Evan Williams, Biz Stone
Key people	Jack Dorsey (Chairman) Dick Costolo (CEO)
Industry	Internet
Revenue	US$140 million (2010 est.)[3]
Employees	2,000+ (2013)[4]
Subsidiaries	Vine
Website	twitter.com
Written in	JavaScript] Ruby,[5]Scala,[ Java[
Alexa rank	10 (November 2013)[7]
Type of site	Social network service,microblogging
Registration	Required to post, follow, or be followed
Users	200 million (active February 2013)[
Available in	Multilingual
Launched	July 15, 2006[
Current status	Active

Twitter is an online social networking andmicroblogging service that enables users to send and read "tweets", which are text messages limited to 140 characters. 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.Twitter Inc. is based in San Francisco and has offices in New York City, Boston, San Antonioand Detroit.

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 500 million registered users in 2012, who posted 340 million tweets per day. The service also handled 1.6 billion search queries per day.Twitter is now one of the ten most visited websites, and has been described as "the SMS of the Internet.