Claim: Twitter's headquarters are in the most populous US state.

Twitter -LRB- -LSB- ˈtwɪtər -RSB- -RRB- is an online news and social networking service where users post and interact with messages , `` tweets '' , restricted to 140 characters . Registered users can post tweets , but those who are unregistered can only read them . Users access Twitter through its website interface , SMS or a mobile device app . Twitter Inc. is based in San Francisco , California , United States , 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 . 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 2016 , Twitter had more than 319 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 election-related tweets sent by 10 p.m. -LRB- Eastern Time -RRB- that day .