The number two executive at social networking giant Facebook, Sheryl Sandberg, has sold $US91 million ($A100.51 million) worth of the company's stock, according to US securities filings.
Facebook shares sold at their initial public offering May 2012 for $US38 but soon after dropped in value.
Only in past days has it recovered and surpassed that value.
The company shares closed on Friday at $US38.50.
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