Twitter

__What is Twitter?__
Twitter is a free service that lets you keep in touch with people through the exchange of quick, frequent answers to one simple question: What are you doing? Twitter is the most popular microblogging application, with almost one million users called twitterers, who can send and receive messages via the web, SMS, instant messaging clients, and by third party applications.

http://twitter.com/education
http://switchspace.blogspot.com/2007/07/twitter-and-education.html -Twitter & Education

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