Foursquare's badges -- awarded for visiting five Starbucks locations, 20 pizza restaurants and so forth -- are fun, but they're also a reminder of how narrowly the network focuses on a young, urban audience, writes Caroline McCarthy. To move beyond that niche, Foursquare will have to radically rethink its approach, she argues. "Foursquare can likely make a healthy business out of encapsulating the social pulse of a city," she notes. "But beyond that, if Foursquare is going to be the next Facebook or Twitter, the basics of the service will have to change."
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