know more about twitter

Twitter is a social networking and microblogging service that allows you answer the question, "What are you doing?" by sending short text messages 140 characters in length, called "tweets", to your friends, or "followers."  You can send your messages using the Twitter website directly, as a single SMS alert, or via a third-party application such as Twirl, Snitter, or the Twitterfox add-on for Firefox.

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Twitter Fan Wiki

Official Twitter Blog

Twitter Handbook Blog

The Big Juicy Twitter Guide by Caroline Middlebrook

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Twitter: New User Quick Start Guide

Mashable's Twitter Guide Book

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