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By Sonja Mack | Published June 3, 2010 | Full size is 500 × 189 pixels

Foursquare (Free). At press time, Foursquare had pretty much cornered the market on location-based social networking. The service lets you use your mobile device to “check in” to various locations, earning badges and street cred along the way. Looking for a hip and happening lounge in the ATL? Ask the crowd, then head over and check in. If you’re lucky, you might be declared “mayor”—briefly.

Foursquare (Free). At press time, Foursquare had pretty much cornered the market on location-based social…