A social network aggregator that lets you see what is happening in all your networks like Facebook, Friendster, Hi5, LinkedIn, and MySpace in one place. Uses the Dapper API.
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flightwise (formerly fboweb.com)
Update for Facebook
Google APIlity Library
Yahoo! Search API Tutorial
RFacebook Ruby Gem
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.