Evan Williams is the co-founder of Twitter, the addictive messaging service that connects the world 140 characters at a time.
Evan Williams helps the world answer the question "What are you doing?" Twitter, the tiny, free world-changing app Williams helped launch, has become a vital connector of people and communities (as well as a fantastic way to keep up with Shaq and Demi Moore).
Before Williams worked on Twitter, he was part of a previous revolution in mass communication, Blogger, while working at Google. He left Google in 2004 to launch the podcasting service Odeo, and Twitter spun out from this in 2006 as a side project based on an idea of Jack Dorsey's.