At least three geo-location social sites boast more members than Foursquare and, as the trend toward checking in online grows among consumers, brands including Gap, Starbucks and Burger King are opting to explore their social marketing efforts with a variety of players. Gap offers members of Loopt a 25% discount after two check-ins, and Starbucks has partnered with Brightkite to offer promotions to members who check in from competitors' cafes.

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