Stephen Lam/Getty ImagesFacebook stock is finally above its IPO price of $38 per share.
On Friday, COO Sheryl Sandberg took the opportunity to sell $91 million worth of stock, according to SEC filings.
Sandberg still has stock and vesting options worth more than $1 billion, making her one of the world's few self-made billionaire women.
Sandberg earned the money. When she joined Facebook in 2008, the place ran more like a frat house than a corporation. Under her guidance it's grown into a $92 billion company with thousands of employees and fast-growing, multi-billion dollar profits.
Meanwhile, Sandberg's memoir/feminist manifesto "Lean In" has been the world's second best-selling non-fiction book for months now.
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