Menlo Park, Calif.

Mark Zuckerberg, chief executive officer of Facebook Inc., center, Sheryl Sandberg, chief operating officer of Facebook, center left, and Robert Greifeld, chief executive officer of Nasdaq OMX Group Inc., center right, remotely ring the opening bell for trading at the Nasdaq MarketSite from the Facebook campus in Menlo Park, Calif. Facebook Inc. began trading Friday after a record initial public offering that made the social network more valuable than almost every company in the Standard & Poor's 500 Index.
Zef Nikolla / Facebook
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