A new report from Pew Internet finds that 74% of smartphone owners use their phone to get real-time location-based information, while 18% use a geosocial service to “check in” to locations or share their whereabouts with friends. The survey goes on to find that over the past year, smartphone ownership among American adults ballooned, from 35% in 2011 to 46% this year, and the overall proportion who get location-based information has almost doubled over that time period, from 23% in May 2011 to 41% in February 2012. The percentage of adults who use geosocial services like Foursquare has likewise risen from 4% in 2011 to 10% in 2012.
For more information, see http://pewresearch.org/pubs/2256/location-based-services-smartphones-foursquare-geosocial-gowalla

