Yelp Enables Check-Ins On Its iPhone App; Foursquare, Gowalla Ousted As Mayors When you think of the idea of “checking-in” at a venue in a mobile app, you likely think of Foursquare or Gowalla right now. The two gained significant momentum, funding, and users in the location space in 2009. But even with the growth, both services are still relatively small, neither much bigger than 200,000 users. T
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