Groupon buys LivingSocial, deal site once valued at $6b

Groupon buys LivingSocial, deal site once valued at $6b

The Groupon smartphone app is displayed on a Motorola Droid Bionic cell phone in Denver November 4, 2011. REUTERS/Rick Wilking

Groupon Inc. agreed to buy LivingSocial Inc., absorbing an old rival in the once-fierce war between companies offering daily deals via e-mail.

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