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Zuckerberg's Fortune Passes Kochs

  • Facebook founder's wealth rises more than $6 billion Thursday
  • The 31-year-old is now America's fourth-richest person

Facebook Crushes 4Q with Video, Mobile Ad Revenue

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Mark Zuckerberg became the sixth-richest person on Earth today.

The Facebook Inc. founder saw his fortune rise $6 billion in trading Thursday after the world’s biggest social network delivered another quarter of record revenue. That gives the 31-year-old a net worth of $47.5 billion, enough to surpass the $45.9 billion holdings of brothers Charles and David Koch, according to the Bloomberg Billionaires Index.