: 32 Net Worth
: $2.1 billion
Facebook's first president is looking to disrupt the Web once again with Airtime, the social video site he plans to launch with his Napster co-founder, Shawn Fanning, by the end of 2012. He's also looking to fix the very music industry he helped break with Napster as an investor and board member of Swedish music platform, Spotify.
(Photo: Simon Dawson/Bloomberg via Getty Images) More From Forbes: The World’s Billionaires The World’s Billionaire Newcomers The World’s Billionaire Dropoffs The Oldest Billionaires in the World The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.