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."
The short format of the tweet is a defining characteristic of the service, allowing informal collaboration and quick information sharing that provides relief from rising email and IM fatigue. Twittering is also a less gated method of communication: you can share information with people that you wouldn't normally exchange email or IM messages with, opening up your circle of contacts to an ever-growing community of like-minded people.
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. (See below for links to Twitter tools and applications.)
Your tweets are displayed on your profile page, on the home page of each of your followers, and in the Twitter public timeline (unless you disable this in your account settings.)
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