Twitter

Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets". It was created in March 2006 by Jack Dorsey and launched that July. The service rapidly gained worldwide popularity, with over 300 million users as of 2011, generating over 300 million tweets and handling over 1.6 billion search queries per day. It has been described as "the SMS (text messaging) of the Internet."

Twitter Inc. is based in San Francisco, with additional servers and offices in New York City.

Projects using Twitter

 * WikiQueer
 * Category:Organizations on Twitter

Adding and following content
There are numerous tools for adding content, monitoring content and conversations including Twitvid (video sharing), Tweetdeck, Salesforce.com, HootSuite, and Twitterfeed. Less than half of tweets are posted using the web user interface with most users using third-party applications (based on analysis of 500 million tweets by Sysomos).