On July 15, 2006, the San Francisco-based podcasting company Odeo
officially releases Twttr—later changed to Twitter—its short messaging
service (SMS) for groups, to the public.

Born as a side project apart from Odeo’s main podcasting platform, the
free application allowed users to share short status updates with groups
of friends by sending one text message to a single number (“40404”).

Over the next few years, as Twttr became Twitter, the “microblogging”
service would explode in popularity, becoming one of the world’s
leading social networking platforms. Twitter was founded by Evan
Williams and another entrepreneur Noah Glass.  

Twitter co-founder Evan Williams.

Twitter co-founder Noah Glass