New Ajax social bookmark URL(you can see with what tags one have bookmarked you) and tag search. Says it will be adding more social bookmarking query services almost daily.
"In folksonomies (...) we get to discover content based on who is tagging it. This is powerful because now we can judge content in terms of who (...), and not just how relevant it might be to some algorithm that doesn’t take into account who-knows-who."
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B. Krause, R. Jäschke, A. Hotho, und G. Stumme. HT '08: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia, Seite 157-166. New York, NY, USA, ACM, (2008)
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R. Wetzker, C. Zimmermann, C. Bauckhage, und S. Albayrak. WSDM '10: Proceedings of the Third ACM International Conference on Web Search and Data Mining, Seite 71--80. New York, NY, USA, ACM, (2010)