An online coupon sent via email from Groupon is pictured on a laptop screen November 29, 2010 in Los Angeles. REUTERS/Fred Prouser

June 2, 2011

An online coupon sent via email from Groupon is pictured on a laptop screen November 29, 2010 in Los Angeles.  REUTERS/Fred Prouser

An online coupon sent via email from Groupon is pictured on a laptop screen November 29, 2010 in Los Angeles. REUTERS/Fred Prouser

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