In this photo taken Friday Nov. 20, 2009, the Foursquare application ...
AP
Mon Nov 23, 12:34 PM ET
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In this photo taken Friday Nov. 20, 2009, the Foursquare application is shown on an iPhone in front of a Starbucks in San Francisco. Foursquare lets you share your whereabouts with friends, no matter if you're at a hot new bar or a neighborhood pet store.

(AP Photo/Russel A. Daniels)

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