Eight years after Zuckerberg launched Facebook in his Harvard dorm room, his social network connects almost 1 billion people and has made him one of the richest people on the planet. He's selling off around 30 million shares in Facebook's IPO, raising $1.1 billion, but he won't be hanging on to most of the cash: Facebook say he'll use it to pay off a massive tax bill on a stock-options exercise.
Facebook's IPO will raise $16 billion, making it the third-largest IPO in U.S. history.
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