SAN FRANCISCO (Reuters) - Facebook Inc Chief Operating Officer Sheryl Sandberg sold $3.75 million worth of stock in the company on Tuesday, her second stock sale since trading restrictions on insiders expired last week. Sandberg sold roughly 176,000 Facebook shares for an average price of $21.24 on Tuesday, according to a regulatory filing on Thursday. Sandberg still owns nearly 19 million vested shares of Facebook, the world's No.1 Internet social network, according to the filing. Last week, Sandberg sold roughly $7.4 million worth of Facebook stock. ...

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