TagCloud is an automated Folksonomy tool. Essentially, TagCloud searches any number of RSS feeds you specify, extracts keywords from the content and lists them according to prevalence within the RSS feeds.
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Y. Yanbe, A. Jatowt, S. Nakamura, und K. Tanaka. JCDL '07: Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries, Seite 107--116. New York, NY, USA, ACM, (2007)