With a net worth of $6.9bn, Facebook founder Mark Zuckerberg is ranked 35 in the "The Forbes 400 - the richest people in America" list, beating Apple's Steve Jobs and Google's Eric Schmidt.
The Apple chief executive was ranked 42 with a net worth of $6.1bn, while Google's Schmidt was ranked at 48 with $5.45bn.
Zuckerberg has also surpassed media tycoon Rupert Murdoch - ranked 79 with $6.2bn - in the list.
The Facebook chief executive had the largest percentage gain this year - with his net worth growing by nearly $4.9 billion - jumping from 158 to number 35 position.
Microsoft chairman Bill Gates is ranked number one with a net worth of $54bn. He has remained at the top of the list for the 17th consecutive year.