The 10 most innovative Web companies - CNN.com: "For ballooning into a global phenomenon that, finally, has a business model. In 2009, Twitter boasted some 20 million users. Today? More than 200 million.
During that period of hockey stick-like growth, Twitter unveiled a sleek redesigned interface, played an integral role in recent revolutions in the Middle East, and introduced Promoted Tweets and Trends, a stream of tweet-size ads that reportedly cost major companies at least $100,000 to purchase."
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