The internet has created some of the world's youngest billionaires, possibly in the shortest possible time scale, ever. The richest are Sergey Brin and Larry Page, the pair who set up Google in the late 1990s. They went from PhD students to (paper) billionaires in about five years. The youngest is 25-year-old Mark Zuckerberg, founder of social networking site Facebook, who has returned to the bill
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