Foursquare is a location based mobile application which allows users to check in on their favorite locations. By checking in all of the friends of the person can see that a certain person has checked in and users can also earn points (badges) by checking in.
This real-life location based “game” is a big hit. Currently foursquare has half a million users.

Starbucks starts cooperating with foursquare by granting users who check in at Starbucks an extra badge. Starbucks wants to start giving regular customers which use Foursquare extra offers in the physical store too.

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Coffee shops have always been very active in mobile strategy and this seems like a new step in the right direction.