No. 2: Mark Zuckerberg
Age: 28
Net Worth: $13.3 billion
Mark Zuckerberg is the founder of Facebook, the popular social network, which now has 1.11 billion people using the site each month. Facebook also says it had 665 million active users each day on average in March and 751 million using Facebook from a mobile device each month. His net worth has actually been fluctuating up and down since the May 2012 debut of Facebook in the stock market. The price of the share hit a low of below $20 in the third quarter of last year. It has since rebounded strongly on the back of expectations of strong numbers on mobile advertisements in the site. He has committed to be an active part in the Giving Pledge spearheaded by Warren Buffett and Bill Gates, donating 18 million shares of Facebook for the education initiatives of the Silicon Valley Community Foundation.