Twitter is a social networking and micro-blogging service that enables its users to send and read other users’ updates known as tweets. Tweets are text-based posts of up to 140 bytes in length. Updates are displayed on the user’s profile page and delivered to other users who have signed up to receive them. Senders can restrict delivery to those in their circle of friends (delivery to everyone being the default). Users can send and receive updates via the Twitter website, SMS, RSS (receive only), or through applications such as TweetDeck and Twhirl. The service is free to use over the web, but using SMS may incur phone services provider fees.
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