Foursquare: Unlock 'Secret' Badges and Reduce Privacy Risks
You've probably heard of social-networking service Foursquare. If you haven't already jumped in headfirst yourself, you may be aware that Foursquare's a location-based social network that lets users "check-in" via mobile device at restaurants, bars, shopping malls, wherever, to obtain points and rewards in the form of "Mayorships" and "badges." And many are calling it "the next Twitter."