Zuckerberg, aged 25, is the youngest person on by 10 years.
He debuted on the list last year at 321 with a net worth of $1.5bn, however earlier this year Russian investment firm Digital Sky Technologies put $200m into Facebook, which set the site's valuation at $10bn.
America's richest man once again this year was Microsoft co-founder Bill Gates with an estimated net worth of $50bn, followed by investor Warren Buffett with $40bn and Oracle founder Larry Ellison with $27bn.
Google co-founders Larry Page and Sergey Brin came in at number 11 with $15.3bn each.
They were followed by Microsoft chief executive Steve Ballmer in 14th place, with an estimated net worth of $13.3bn. Eric Schmidt looked a mere pauper by comparison with a fortune of just $5.5bn.
Media mogul and News Corporation chief executive Rupert Murdoch came in at number 37 with $6bn, just above Apple chief executive Steve Jobs at number 43, with a net worth of $5.1bn.
Director Steven Spielberg came in at 97 with $3bn, $700m above TV host Oprah Winfrey, who placed 141 with a net worth of $2.3bn.
A newcomer to the list is Marvel Entertainment chief Isaac Perlmutter in 230th place. Perlmutter's net worth soared in August to $1.55bn after Disney agreed to buy his firm for $4bn in cash and stock.
Yahoo! co-founders David Filo and Jerry Yang, came in at 296th and 317th place respectively, with net worths of $1.3bn and $1.25bn.
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