Groupon employee shows Breadcrumb to a visitor at their booth at the National Restaurant Association Tradeshow at McCormick Place, on Sunday, May 19, 2013 in Chicago, IL. Groupon highlights the company's marketing and Breadcrumb by Groupon point-of-sale and payments at the tradeshow. (John Konstantaras / AP Images for Groupon)

Associated Press
Groupon employee shows Breadcrumb to a visitor at their booth at the National Restaurant Association Tradeshow at McCormick Place, on Sunday, May 19, 2013 in Chicago, IL. Groupon highlights the company's marketing and Breadcrumb by  Groupon point-of-sale and payments at the tradeshow. (John Konstantaras / AP Images for Groupon)
Groupon employee shows Breadcrumb to a visitor at their booth at the National Restaurant Association Tradeshow at McCormick Place, on Sunday, May 19, 2013 in Chicago, IL. Groupon highlights the company's marketing and Breadcrumb by Groupon point-of-sale and payments at the tradeshow. (John Konstantaras / AP Images for Groupon)
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