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Cattuto, C., Benz, D., Hotho, A. & Stumme, G. Semantic Grounding of Tag Relatedness in Social Bookmarking Systems 2008 The Semantic Web - ISWC 2008The Semantic Web - ISWC 2008   incollection DOIURL  
Abstract: Collaborative tagging systems have nowadays become important data sources for populating semantic web applications. For tasks like synonym detection and discovery of concept hierarchies, many researchers introduced measures of tag similarity. Even though most of these measures appear very natural, their design often seems to be rather ad hoc, and the underlying assumptions on the notion of similarity are not made explicit. A more systematic characterization and validation of tag similarity in terms of formal representations of knowledge is still lacking. Here we address this issue and analyze several measures of tag similarity: Each measure is computed on data from the social bookmarking system del.icio.us and a semantic grounding is provided by mapping pairs of similar tags in the folksonomy to pairs of synsets in Wordnet, where we use validated measures of semantic distance to characterize the semantic relation between the mapped tags. This exposes important features of the investigated similarity measures and indicates which ones are better suited in the context of a given semantic application.
  author = {Cattuto, Ciro and Benz, Dominik and Hotho, Andreas and Stumme, Gerd},
  title = {{Semantic Grounding of Tag Relatedness in Social Bookmarking Systems}},
  booktitle = {The Semantic Web - ISWC 2008},
  journal = {The Semantic Web - ISWC 2008},
  publisher = {Springer Berlin / Heidelberg},
  year = {2008},
  volume = {5318},
  pages = {615--631},
  url = {http://tagora-project.eu/wp-content/2009/09/cattuto_iswc2008.pdf},
  doi = {http://dx.doi.org/10.1007/978-3-540-88564-1\_39}

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