Twitter: What are you doing?

What is Twitter?

Twitter is a service for friends, family, and co–workers to communicate and stay connected through the exchange of quick, frequent answers to one simple question: What are you doing?

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Twitter is the telegraph system of Web 2.0.

Nicholas Carr, Author and Technologist
It's almost like ESP

Wired
Suddenly, it seems as though all the world's a-twitter.

Newsweek

What is Twitter?

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