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In this paper we analyze the structure of collaborative tagging systems as well as their dynamic aspects. Specifically, we discovered regularities in user activity, tag frequencies, kinds of tags used, bursts of popularity in bookmarking and a remarkable stability in the relative proportions of tags within a given URL. We also present a dynamic model of collaborative tagging that predicts these stable patterns and relates them to imitation and shared knowledge. <\/jats:p>","DOI":"10.1177\/0165551506062337","type":"journal-article","created":{"date-parts":[[2006,3,21]],"date-time":"2006-03-21T15:17:46Z","timestamp":1142954266000},"page":"198-208","source":"Crossref","is-referenced-by-count":1217,"title":["Usage patterns of collaborative tagging systems"],"prefix":"10.1177","volume":"32","author":[{"given":"Scott A.","family":"Golder","sequence":"first","affiliation":[]},{"given":"Bernardo A.","family":"Huberman","sequence":"additional","affiliation":[{"name":"Information Dynamics Lab, HP Labs, Palo Alto, CA, USA"}]}],"member":"179","published-online":{"date-parts":[[2006,4,1]]},"reference":[{"key":"atypb1","volume-title":"Organizing Knowledge","author":"J. Rowley","year":"1995"},{"key":"atypb2","volume-title":"Ontology is Overrated: Categories, Links and Tags","author":"C. 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