Foursquare has been on Windows Phone for a while now, where the concept of pulling out your phone, checking in, and seeing where friends are seems pretty natural. It's doubtful you'll be hauling a Surface tablet or notebook out of a backpack to let your buddies know you're at the local watering hole.
So far, the Foursquare app is a step forward to validate Windows 8. But there are still a bunch of apps that Microsoft promised would be available on Win8, and have yet to be delivered: Facebook, Flipboard, and Rhapsody, among others. Until those promises are delivered, Microsoft will still carry the reputation of lagging behind other mobile platforms.
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