10 richest nerds in the world
Net worth
$21 billion
Zuckerberg, the 27-year-old co-founder of Facebook, is worth at least $21 billion. Still, based on the roughly $100 billion valuation that the Menlo Park, California-based company has fetched in private markets, Zuckerberg's stake may be worth about 25 percent less than previous estimates, once Facebook holds its initial public offering. The company intends to issue about 500 million shares of its Class B stock at the offering, diluting Zuckerberg's ownership to 21 percent after he exercises 120 million options and sells about 42 million shares to cover the tax bill associated with the gain from those options.