Hands Up uses FourSquare to help people find out who is around them. If you are at an event and you see someone else is there, you hold up your phone and wave hello.
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The Profane Game
flightwise (formerly fboweb.com)
Credits API Documentation
Tutorial for a IP to geolocation aggregator script
Yahoo! Search API Tutorial
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.