BibSonomy publications for /user/a_olympia/deliciousSat Aug 18 13:22:24 CEST 2007AugThe Structure of Collaborative Tagging Systems2005network_analysis scale-free tag computer-networks no-tag wasabee software socialsoftware core_periphery interface sociology delicious collective networking linguistics datamining eni classification self-organization socialnets social_networks collaborative_tagging information_organization emergence clustering socialtagging web20 folksonomies trends community farsi-media tagging tags social-networks semantics collaborative socialbookmarking folksonomy networks cooperation social emergent collaboration ict semiotics Collaborative tagging describes the process by which many users add metadata in the form of keywords to shared content. Recently, collaborative tagging has grown in popularity on the web, on sites that allow users to tag bookmarks, photographs and other content. In this paper we analyze the structure of collaborative tagging systems as well as their dynamical 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 dynamical model of collaborative tagging that predicts these stable patterns and relates them to imitation and shared knowledge.