The average age is 63 years, but Facebook founders Mark Zuckerberg and Dustin Moskovitz are the youngest self-made billionaires at 28 and 29, respectively, Hurun said.

CNN: Report: U.S., China dominate global billionaires

After popping more than 20% on Wednesday, Facebook founders Mark Zuckerberg and Dustin Moskovitz found their way back to the bottom on Friday, as the biggest losers in percentage terms.

FORBES: Who Got Rich This Week: A Toyota Target, An IT Innovator And More

Founders: Mark Diks, 45, and Pieter Diks, 44, board member Stock options: 12% interest in company Why on the list: The Diks brothers now run 400 stores in the Netherlands' formerly fragmented bedroom-furniture market.

FORBES: 20 FOR 2000

Why not, thought Alliance founders Robert Zhang and Mark Baldwin, post job advertisements on the Internet?

CNN: FROM SURF TO WORK

Yes, this all sounds very entertaining, but my first question for Christopher Brown and Mark Hunter, co-founders of TruthSerum.com, had to do with the accuracy and credibility of their invention.

FORBES: Is Your Personality More Like Barack Obama's Or Mitt Romney's?

's Mark Zuckerberg all saw their co-founders leave before their companies truly took off.

WSJ: Microsoft Co-Founder Hits Out at Gates

It is due to move in on 19 February, which will mark the next step in an emotional journey for the charity and its founders.

BBC: Mark's Pit Stop homeless charity finds new base

Zynga CEO Mark Pincus, who was supposed to speak on the first session, has been replaced by Founders Fund managing partner and Forbes cover boy Sean Parker.

FORBES: Web 2.0 Summit: Where's Mark? And Where's Paul? (Updated)