Date: 12/9/2010

While most young rich dudes are contemplating which new car to buy or which island they want to charter a jet to next, Zuckerberg bossed up and signed up with for The Giving Pledge, a promissory group founded by Warren Buffet and Bill Gates which looks to get billionaires to pledge large parts of their net worth to charity instead of giving it away to heirs. At the time Zuck was worth around $6 billion, but now with the company's IPO just around the corner, that will nearly double.