Since its 2006 launch, Twitter has been, in many respects, an unbridled success story. It is now one of the 10 most visited websites in the world and is used by 13% of the US population. Its users generate an average 200 million posts every day.And it is not all banal chatter; many a news story has been broken in 140 characters or less, long before being picked up by traditional media outlets. In Egypt, Tunisia, Iran and Moldova it even played a central role in organising large-scale Drotest and revolution.
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