Most college students use their dorm rooms to sleep, study, or do things their parents probably don't want to know about. Mark Zuckerberg founded Facebook in his. Originally meant only for Harvard students, the popular social networking site quickly spread to the rest of the Ivies and other colleges across the nation. As Facebook's popularity exploded, Zuckerberg packed up his bags and relocated the fledgling company to Palo Alto, California, forever leaving behind Harvard's hallowed halls. So far, the decision has worked out pretty well for the twenty-something. According to Forbes, Zuckerberg is the youngest billionaire in the world, with a 2010 net worth of $4 billion.
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