In creating a multimedia travelogue of my recent trip to Europe, I checked in to the most interesting places I visited using the location-based service Foursquare . Launched in March 2009 and serving more than 50 million users, Foursquare is a social networking site that lets you bookmark (i.e., "check in" at) venues based on your geographic location. As with all such services, the more information about you available to the system, the better the interactions. However, as much as I love it, Foursquare suffers from data sparsity and the closed world problem for me—I'm an irregular user, so…
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