Twitter Twitter is a microblogging and social networking service on which users post and interact with messages known as "tweets", owned by American company Twitter, Inc. Registered users can post, like, and retweet tweets, however, unregistered users have the ability to only read tweets that are publicly available. Users interact with Twitter through browser or mobile frontend software, or programmatically via its APIs. Prior to April 2020, services were accessible via SMS. Tweets were originally restricted to 140 characters, but the limit was doubled to 280 for nonCJK languages in November 2017. Audio and video tweets remain limited to 140 seconds for most accounts. Twitter was created by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams in March 2006 and launched in July of that year. Twitter, Inc. is based in San Francisco, California and has more than 25 offices around the world. By 2012, more than 100 million users posted 340 million tweets a day, and the service