Search twitter bios and location, allowing for searches like "rails developers in austin" and "mom blogger. Results are sorted by Infochimps Trstrank (similar to Klout score) so the most influential people are listed first.
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flightwise (formerly fboweb.com)
Yahoo! Search API Tutorial
RFacebook Ruby Gem
Building a sentiment analyser for your Twitter feed
Twitter powered Youtube subtitles
Twittery - Ruby Wrapper to Twitter
Twitter4R - Ruby Twitter Binding
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