CEO of Facebook
Net worth: $13.5 billion
Mark Zuckerberg, the 26-year-old founder and CEO of the ubiquitous Facebook, has seen his net worth surge as investments from firms like Goldman Sachs (GS) helped lift Facebook's valuation to $50 billion. As for concrete revenue, Facebook raked in $1.86 billion in 2010 from the ads that appear on the right side of pages. That's an 86 percent increase over the previous year. For 2011, ad revenue is predicted to double to $4 billion, putting young Mr. Zuckerberg in a financial spot anyone would love.
Slideshow: Tech's Youngest Billionaires