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check ins geospatial lbs location-based group chat mobile apps nfc peer-to-peer proximity-based social network slbc smartphones social and location social lbs social location-based services social network social networking spatial annotations spatial broadcasting spatial networking spontaneous groups
check ins geospatial lbs location-based group chat mobile apps nfc peer-to-peer proximity-based social network slbc smartphones social and location social lbs social location-based services social network social networking spatial annotations spatial broadcasting spatial networking spontaneous groups …less
