Twitter

Twitter is an online social networking service that enables users to send and read short 140-character messages called "tweets". Registered users can read and post tweets, but unregistered users can only read them.

Founded: March 21, 2006, San Francisco, California, United States
CEO: Jack Dorsey
Headquarters: San Francisco, California, United States
Founders: Evan Williams, Noah Glass, Jack Dorsey, Biz Stone

                                                              Twitter Inc.