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Twitter is a social networking and micro-blogging service that allows users to send updates (text-based posts, up to 140 characters long) via SMS, instant messaging, the Twitter website, or an application such as Twitterrific. Twitter was founded in October 2006 by San Francisco start-up company Obvious Corp. Updates are displayed on the user's profile page and also instantly delivered to other users who have signed up to receive them. The sender can restrict delivery to those in his or her c ...
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