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The inherent lexical ambiguities of tags strongly affect the extraction of structured knowledge and the quality of tag\u2010based recommendation systems. In this paper, we propose a methodology for the analysis of tag\u2010based systems, addressing tag synonymy and homonymy at the same time in a holistic approach: in more detail, we exploit a tripartite graph to reduce the problem of synonyms and homonyms; we apply a customized version of Tag Context Similarity to detect them, overcoming the limitations of current similarity metrics; finally, we propose the application of an overlapping clustering algorithm to detect contexts and homonymies, then evaluate its performances, and introduce a methodology for the interpretation of its results. Copyright \u00a9 2012 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/spe.2150","type":"journal-article","created":{"date-parts":[[2012,8,14]],"date-time":"2012-08-14T07:31:11Z","timestamp":1344929471000},"page":"1437-1457","source":"Crossref","is-referenced-by-count":6,"title":["Exploiting tag similarities to discover synonyms and homonyms\u2009in\u2009folksonomies"],"prefix":"10.1002","volume":"43","author":[{"given":"Davide","family":"Eynard","sequence":"first","affiliation":[{"name":"Institute for Communication Technologies Universit\u00e0 della Svizzera Italiana  Lugano Switzerland"}]},{"given":"Luca","family":"Mazzola","sequence":"additional","affiliation":[{"name":"Institute for Communication Technologies Universit\u00e0 della Svizzera Italiana  Lugano Switzerland"}]},{"given":"Antonina","family":"Dattolo","sequence":"additional","affiliation":[{"name":"SASWEB Research Lab, Department of Mathematics and Computer Science University of Udine  Udine Italy"}]}],"member":"311","published-online":{"date-parts":[[2012,8,14]]},"reference":[{"key":"e_1_2_9_2_1","series-title":"Advances in Intelligent and Soft Computing","first-page":"315","volume-title":"Human\u2010computer Systems Interaction: Backgrounds and Applications 2","author":"Dattolo A","year":"2011"},{"key":"e_1_2_9_3_1","unstructured":"Vander WalT.Folksonomy Definition and Wikipedia November2005. 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