example: Barack Obama, Pittsburgh Steelers, Lost
thumb|right|The twitter bird logo often seen around the website
Twitter is a free social networking and micro-blogging service that enables its users to send and read each others' updates, known as tweets. Tweets are text-based posts of up to 140 characters, displayed on the author's profile page and delivered to other users - known as followers - who have subscribed to them. Senders can restrict delivery to those in their circle of friends or, by default, allow open access. Users can send and receive tweets via the Twitter website, Short Message Service (SMS) or external applications. The service is free over the Internet, but using SMS may incur phone service provider fees.
Since its creation in 2006 by Jack Dorsey, Twitter has gained notability and popularity worldwide. It is sometimes described as the "SMS of the Internet", as it provides the functionality—via its application programming interface (API)—for other desktop and web-based applications to send and receive short text messages, often obscuring the Twitter service itself.
Through SMS, users can communicate with Twitter through five gateway numbers: short codes for the United States, Canada, India, New Zealand, and an Isle of Man-based number for international use. There is also a short code in the United Kingdom which is only accessible to those in the Vodafone network.
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About Twitter
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Articles
Twitter users can 'buy' followers
...users will be able to boost their popularity on the microblogging site by 'buying' groups of followers from a new company, uSocial. Twitter users can 'buy' followers through a new scheme run by uSocial uSocial, a social media marketing...
Is Twitter news outlet for 21st century?
...CNN's thin early coverage of the revolution in Iran and voiced their complaints (where else?) on Twitter. Some said they preferred news on Twitter to the cable news network. Read business stories in हिंदी | ગુજરાતી Twitter's constantly...
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http://www.mirror.co.uk/news/top-stories/2009/06/25/twitter-ad-link-to-iran-is-slammed-115875-21469490/
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http://tech.yahoo.com/news/ap/20090616/ap_on_hi_te/us_tec_techbit_twitter_bloomsday
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http://www.guardian.co.uk/technology/blog/2009/jun/02/twitter-gender-balance
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http://news.digitaltrends.com/news-article/20082/twitter-hit-with-another-attack-this-time-for-profit
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Videos
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The Twitter Global Mind
Who's afraid of the big bad Tweets?Goocam World Map, Town Square, Shake Shack, Waiting in line at Shake Shack. Moving surprisingly slow., Google CEO: Twitter A 'Poor Man's Email System', Google Blog Search Results for 'Watchmen', Twitter Search Results for 'Watchmen', MT-Hacks: Realtime Twitter Search Results on Google, Mark Carey, , Google Buys Jaiku
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Twitter on Nightline (February 26th, 2009)
Evan Williams (@ev), Biz Stone (@biz) and Dominic Sagolla (@dom) on Wednesday night's Nightline. John Donvan NL (@JohnDonvanNL) Reporting. This segment of Nightline discusses Twitter, what it is, how it works and the people behind it with a short interview with @dom