A directory of Twitter lists, listatlas shows you what's popular, fast-growing and new. You can also search by keyword and find Twitter lists.
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flightwise (formerly fboweb.com)
Update for Facebook
Yahoo! Search API Tutorial
RFacebook Ruby Gem
Update Twitter with Command Line Tools
Twitter .NET API
TwitterLand Ruby Gem
java-twitter - Google Code
Plus 1 Contest and Voting
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.