Twitter is a social networking and micro-blogging 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.”(Hit the video for visual knowledge)
Twitter is a free 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 characters in length which are displayed on the user’s profile page and delivered to other users who have subscribed to them (known as followers). Senders can restrict delivery to those in their circle of friends or, by default, allow anybody to access them. Users can send and receive tweets via the Twitter website, Short Message Service (SMS) or applications such as Tweetie, Twitterrific, Twitterfon, TweetDeck and feedalizr. Users can also add tweeted pictures by using Twitpic. The service is free to use over the Internet, but using SMS may incur phone service provider fees.
Since its creation in 2006, Twitter has gained extensive notability and popularity worldwide. It is often described as the “SMS of Internet,” in that the site provides the functionality (via its application programming interfaces) for other desktop and web-based applications to send and receive short text messages, often obscuring the Twitter service itself.
During the 2008 Mumbai attacks, eyewitnesses sent an estimated 80 tweets every five seconds as the tragedy unfolded. Twitter users on the ground helped in compiling a list of the dead and injured. In addition, users sent out vital information such as emergency phone numbers and the location of hospitals that needed blood donations.In January 2009, US Airways Flight 1549 experienced multiple bird strikes and had to be ditched in the Hudson River after takeoff from LaGuardia Airport in New York City. Janis Krums, a passenger on one of the ferries that rushed to help, took a picture of the downed plane as passengers were still evacuating and tweeted it via TwitPic before traditional media arrived at the scene. In February 2009, the Australian Country Fire Authority used Twitter to send out regular alerts and updates regarding the 2009 Victorian bushfires. During this time, the Prime Minister of Australia, Kevin Rudd, also used his Twitter account to send out information on the fires, how to donate money and blood, and where to seek emergency help.(by wikipedia)
Some most famous twitter ids clik here
One more video about twitter, must see.
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