My Faves lets users browse and search the tweets they've marked as "favorites" over time.
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flightwise (formerly fboweb.com)
I would have liked to be one of you
Scripting Twitter with Perl
Yahoo! Search API Tutorial
RFacebook Ruby Gem
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140dev Twitter Framework
Twitter By Phone Code Walkthrough
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.