Is location-based social networking practical in spread-out Los Angeles?

Sure, you can beam your location through Foursquare, Loopt or Gowalla, but what's unanswered is whether anyone is likely to face a freeway for a meet-up. In early May, Mark Ghuneim was sitting in his hotel room at the Four Seasons near Beverly Hills. He discovered, via his iPhone's Foursquare app, that a friend was at the Echo, a concert venue in Echo Park about eight miles away, about to watch a concert. ...

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