Thanks to Facebook stock closing higher than ever, Bloomberg reports the company's COO is now one of the youngest female billionaires on the planet.

Sandberg has liquidated a large chunk of her even larger stake in Facebook, but there's still a whopping $750 million in shares on her plate. Add that to the few hundred million she's made from stock sales, book royalties, and already being rich before she worked at Facebook, and you can definitely say Sheryl Sandberg is doing just fine.

"Did she do a billion dollars-worth of work? I don't know,"David Kirkpatrick, author of "The Facebook Effect," a history of the company, said in a telephone interview. "She had the good fortune to land in the right place where her talents could really be applauded."

That inevitable run for office will be well-funded, for sure.

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