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Reach: 100,000 users
Cost: Free for now, although the company plans to eventually charge for the service
Foursquare is a cell phone application that lets users broadcast their location to friends. Using the program, members can "check in" when they are at a local establishment, and sometimes add tips about what to buy. BJ Emerson, director of information and social technologies for Tasti D-Lite, a chain of frozen-dessert shops headquartered in Franklin, Tennessee, said, "It's not just a matter of click-throughs and impressions; I know when I have actual feet in the door."