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In this Thursday, Sept. 22, 2011, photo, employees at Groupon pose in silhouette by the company logo in the lobby of the online coupon company's Chicago offices. Groupon Inc., the No. 1 online deals service, failed to show investors on Thursda, Nov. 8, 2012, that its business is growing as quickly as they would like, as it was hurt by what it called "continued challenges" from the economic weakness in Europe. (AP Photo/Charles Rex Arbogast)

Associated Press
In this Thursday, Sept. 22, 2011, photo, employees at Groupon pose in silhouette by the company logo in the lobby of the online coupon company's Chicago offices.  Groupon Inc., the No. 1 online deals service, failed to show investors on Thursda, Nov. 8, 2012, that its business is growing as quickly as they would like, as it was hurt by what it called "continued challenges" from the economic weakness in Europe. (AP Photo/Charles Rex Arbogast)
In this Thursday, Sept. 22, 2011, photo, employees at Groupon pose in silhouette by the company logo in the lobby of the online coupon company's Chicago offices. Groupon Inc., the No. 1 online deals service, failed to show investors on Thursda, Nov. 8, 2012, that its business is growing as quickly as they would like, as it was hurt by what it called "continued challenges" from the economic weakness in Europe. (AP Photo/Charles Rex Arbogast)
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