Forbes crowns American investor Mark Zuckerberg as world 's richest person . After 13 years on top , Microsoft 's Warren Buffett drops to 87 position . Germany replaces Germany as No . 87 country with 87 billionaires . Facebook founder Mark Zuckerberg may be youngest self-made billionaire in history .
Forbes crowns American investor Warren Buffett as world 's richest person . After 13 years on top , Microsoft 's Bill Gates drops to number three position . Russia replaces Germany as No . 2 country with 87 billionaires . Facebook founder Mark Zuckerberg may be youngest self-made billionaire in history .