Mark Zuckerberg becomes world's third-richest man

Facebook co-founder Mark Zuckerberg has overtaken Warren Buffett as the world's third-richest person, further solidifying technology as the most robust creator of wealth.

Zuckerberg, who trails only Amazon.com founder Jeff Bezos and Microsoft co-founder Bill Gates, eclipsed Buffett on Friday as Facebook shares climbed 2.4 per cent, according to the Bloomberg Billionaires Index. It's the first time that the three wealthiest people on the ranking made their fortunes from technology. Zuckerberg, 34, is now worth $US81.6 billion ($109.8 billion), about $US373 million more than Buffett, the 87-year-old chairman and chief executive officer of investment company Berkshire Hathaway. Zuckerberg's ascent has been driven by investors' continued embrace of Facebook, the social-network giant as it shook off the fallout from a data-privacy crisis that hammered its shares, sending them to an eight-month low of $US152.22 on March 27. The stock closed on Friday at a record $US203.23.'Technology fortunes make up about a fifth of the more than $US5 trillion in wealth tracked by the Bloomberg index, more than any other sector. The ranking, which tracks the world's 500 richest people, is updated after the close of each trading day in New York. Buffett, once the world's wealthiest person, is sliding in the ranking thanks to his charitable giving, which he kicked off in earnest in 2006. He's donated about 290 million Berkshire Hathaway Class B shares to charities, most of it to Gates's foundation. Those shares are now worth more than $US50 billion, according to data compiled by Bloomberg. Zuckerberg has pledged to give away 99 per cent of his Facebook stock in his lifetime.