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Foursquare is a smartphone app that is quickly becoming one of the most popular and useful geo-networking tools for general social networking and for promoting business. Unlike other social networks, Foursquare encourages people to get out and enjoy their city by sharing check-ins, tips and to-dos while earning points and badges as they explore new venues and favorite hang-outs.

I've had my home address posted for anyone to see since as long as I've been living. It's called a telephone book and this technology lists the names, addresses and phone numbers of virtually every resident of every location. Scary.