Number 6: Mark Zuckerberg, US: Net worth: $1.5 billion
Tech's newest golden boy is the youngest billionaire on the planet, as well as a bit of a philosopher. He founded social-networking site Facebook in February 2004 from his Harvard dorm room. Today Facebook boasts 66 million active users. According to his own Facebook profile, some of Zuckerberg's interests include "breaking things, revolutions and eliminating desire for all that really doesn't matter." Favorite band: Green Day. (Image courtesy:Reuters)
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