Some time ago i was reading an article at wired.com about the Phoenix Mars Lander giving regular updates and answering questons over Twitter.
Last week i met some people who are really hooked on twitter (one claiming that he would never date a girl whos not using twitter o_o).
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So what is Twitter?
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Microblogging (>140 charachters) network delivering updates via twitter, sms, email and facebook. Your updates are public by default but you can also restrict availability to people in your followers list. You can also define which peoples updates you want to recieve at your devices. Interstroups can be formed and the groups updates followed.
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Twitter can be used to spread information instantly and completely mobile as updates can be published and recieved by your mobile phone.
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The Twitter development began in 2006 in the San Francisco based company Obvious, LLC. In April 2007 the company spun off Twitter as a separate entity under the name Twitter Inc. with Jack Dorsey, who is regarder as the man behind Twitter, as its CEO.
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cheers @martinmrt