TY - JOUR AU - Capocci, Andrea AU - Caldarelli, Guido T1 - Folksonomies and clustering in the collaborative system CiteULike JO - Journal of Physics A: Mathematical and Theoretical PY - 2008/ VL - 41 IS - 22 SP - EP - UR - http://stacks.iop.org/1751-8121/41/224016 M3 - KW - *** KW - citeulike KW - clustering KW - dataset KW - folksonomy KW - network KW - properties L1 - SN - N1 - N1 - AB - We analyze CiteULike, an online collaborative tagging system where users bookmark and annotate scientific papers. Such a system can be naturally represented as a tri-partite graph whose nodes represent papers, users and tags connected by individual tag assignments. The semantics of tags is studied here, in order to uncover the hidden relationships between tags. We find that the clustering coefficient can be used to analyze the semantical patterns among tags. ER -