Twitter has filed documents with regulators to begin the process of going public. Analysts expect the social network to be valued at around $10 billion, bolstered by its projected 40% growth rate and $1 billion revenue run rate. "If 2012 was the Facebook IPO horror story, then all of a sudden 2013 is looking very nice. We're now seeing that these are real companies proving they can drive very, very impressive revenue," says venture capitalist Rick Heitzmann.
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