New estimates are out detailing the size of the local advertising market opportunity for mobile players, like Foursquare, Gowala and others. In 2014, U.S. mobile local ad revenues will grow to $2.02 billion in 2014 from $213 million in 2009, according to data from BIA/Kelsey.
The research and consulting firm defines mobile local advertising as advertising that is targeted based on a user

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