The latest Twitter news and updates. Twitter is a social networking service, primarily microblogging but also a picture and video sharing service, founded by Jack Dorsey, Noah Glass, Biz Stone and Evan Williams in 2006. Subsidiaries of the company have included Vine, Periscope and MoPub. Twitter's biggest competitors are Facebook, Instagram and TikTok. In 2022, after a lengthy back and forth, Tesla CEO and investor Elon Musk purchased Twitter for $44 billion.