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The Facebook Inc. logo is displayed with the word "unchanged" prior to trading at the Nasdaq MarketSite in New York, U.S., on May 18, 2012.
Associated Press
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The stock tumbled 5.1 percent to $26.81 at the close in New York, the biggest drop since Sept. 24. Shares in the operator of the world's largest social-networking service have declined 29 percent since selling at $38 apiece in an initial public offering in May.Galleries by Category