New York — Facebook co-founder Mark Zuckerberg is poised to leapfrog Warren Buffett to become the world’s third-richest person. Zuckerberg, more than a half-century younger than the Berkshire Hathaway chairman, is now worth $81.3bn, gaining $8.5bn this year as Facebook shook off a data-privacy crisis that caused its stock to tumble 18%. Its rebound from a closing low of $152.22 on March 27 to a record $201.45 at 9.45am on Wednesday in New York narrowed the gap with Buffett to $725m, according to the Bloomberg Billionaires Index. The recovery in Facebook shares has rewarded other insiders as well, including chief operating officer Sheryl Sandberg, who’s now worth $1.8bn, and chief technology officer Michael Schroepfer, whose 0.05% holding is valued at $224m. Zuckerberg also trails Amazon founder Jeff Bezos, the world’s richest person with a $143.6bn fortune on Tuesday, and Microsoft co-founder Bill Gates, with $92.7bn. The Bloomberg index ranks the world’s 500 richest people and is u...

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