http://d.yimg.com/a/p/ap/20100825/ca...k6nr8hOsUYbg--AP - Services ****d on your location, such as Foursquare, are popular in the tech-centric bubbles of Silicon Valley and New York City. But for many people, these services remain odd — and potentially creepy — tools on your smart phone to let friends or even strangers know you just showed up to a restaurant, gym or the corner deli.
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