When Mark Zuckerberg launched TheFacebook.com from his Harvard dorm room in 2004, he likely had little clue it would revolutionize the Web. Now, the company that redefined the word "social" is poised to go public in a very big way. With over 900 million active monthly users and a reported valuation around $76 billion, Facebook may be the largest tech IPO of all time. For Zuckerberg, there's arguably little not to "Like" about that.
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Exxon Mobil knocks Wal-Mart from the top spot. Who else made the top 50 this year?