Jack Dorsey, Noah Glass, Biz Stone & Evan Williams

Twitter, Inc.

Twitter, Inc. was a social media company founded in March 2006 in San Francisco, spun off from Obvious Corporation (formerly Odeo), operating the Twitter platform and other services. It prioritised uptime and design principles over revenue until after 2008, grew to over 100 million users by 2012 and 330 million monthly active users by 2019, went public in November 2013, and was acquired by Elon Musk for $44 billion in April 2022 before merging into X Corp. in April 2023. No source states its revenue model, unit economics, or profitability.