likeexchange.net is a website that enables Facebook fan page discovery and helps its members exchange likes with each other.
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flightwise (formerly fboweb.com)
Near Real-time Twitter
My Friends Mosaic
Yahoo! Search API Tutorial
RFacebook Ruby Gem
Facebook.NET: Open Source for Facebook
Perl library for Facebook
Rfacebook: Ruby on Rails Library for Facebook
Rovi Mobile Music
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.