Sean Parker
Net Worth: $ 1.6 billion
Company: Facebook
Silicon Valley strategist and former Facebook president makes his billionaire debut. His reported stake: just under 3 per cent. At age 19 the serial entrepreneur cofounded Napster in 1999; brought free music to the masses, but quickly collapsed under piracy allegations. Parker joined Facebook in 2004. Recently made more famous after being played by Justin Timberlake in the Oscar-winning film The Social Network. He's currently a managing partner at Founders Fund, a venture capital firm that invests in tech companies.