Location-based services like Facebook Places, Foursquare and Gowalla might be less used than we thought.
Only 16.7 million U.S. mobile subscribers used check-in services on their phones in March 2011, representing 7.1 percent of the entire mobile population, according to comScore. Out of all check-in users, just 12.7 million used the services on a smartphone, representing 17.6 percent of the smartphone population.
