Walgreens launched a Foursquare campaign on March 6 that offers discounts to customers checking into store locations, said Rich Lesperance, Walgreens's director of digital marketing and emerging media.
Groupon's and LivingSocial's email open rates continue to trend upward, according email and social analytics firm eDataSource.
Microsoft Corp. launched a desktop site for its daily deals aggregation service Bing Deals on Sept. 23.
Google has led several technology industry giants, including Facebook, Amazon.com and AT&T, into the daily deals sector in recent weeks to challenge Groupon and LivingSocial in the $1.25 billion deals market.
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