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Facebook shares make their stock market debut

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)
Times Square
Facebook is listed on the Nasdaq stock exchange shown on the board in Times Square in New York.  (Carolyn Cole / Los Angeles Times)
Times Square
Tourists watch as Facebook is listed on the Nasdaq stock exchange shown on the board in Times Square in New York.  (Carolyn Cole / Los Angeles Times)
Times Square
Facebook founder Mark Zuckerberg is seen on a screen in Times Square moments after he rang the opening bell for the Nasdaq stock market board. (Spencer Platt / Getty Images)
Menlo Park, Calif.
Facebook employees kick off Hackathon 31 at the Facebook headquarters in Menlo Park, Calif., on Thursday. The Facebook Hackathon, held every few months, is when everyone builds prototypes for new ideas. The Hackathon came a day before Facebook began public trading on Nasdaq.  (Francis Luu / Facebook)
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