Location-based applications such as Foursquare and Facebook Places have become an important marketing tool for some small businesses, especially those such as restaurants and bars that rely heavily on foot traffic to bring in customers. Chamin Mills of Bay-Area seafood chain Pacific Catch offers a deal -- from free sweet potato fries to a free shrimp ceviche -- to customers when they use Foursquare within a few blocks of the restaurant. Experts say the first steps to using the services are to claim your site and start setting clear goals.

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