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 . American investor Warren Buffett has been named world 's richest person . Score: 7 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 . Score: 7 Facebook founder Mark Zuckerberg may be youngest self-made billionaire in history .