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Semantics of Human Tags at CiteULike
Social bookmarking has been a popular service in Internet. The co-occurrence of human tag and the text it annotated for gives us a way to explore the meaning of the tag. Such semantic knowledge would be useful in understanding user information needs in IR. Here is a demo based on the dataset of CiteULike from Nov. 2004 to Feb. 2007.

(Prefix Search: search tags with the prefix you typed, e.g. mach for machine. Semantic Map: search tags which can map to the single word you typed)