Regensburg 2007 – wissenschaftliches Programm
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AKSOE: Arbeitskreis Physik sozio-ökonomischer Systeme
AKSOE 4: Poster Session (posters are expected to be displayed the full day (9:00-18:00)
AKSOE 4.4: Poster
Montag, 26. März 2007, 16:30–18:00, Poster D
Investigating community structure in social tagging systems — •Vito Servedio1,2, Andrea Baldassarri1, Ciro Cattuto2,1, and Vittorio Loreto1 — 1La Sapienza University Physics Department, Roma, Italy — 2Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Roma, Italy
A social classification paradigm known as "collaborative tagging" has been successfully deployed in popular web applications designed to manage and share diverse online media. Users of these systems organize resources by associating them with freely chosen text labels, or "tags". The adoption of collaborative tagging has recently surged: Millions of users are already involved, and as a result huge human-annotated databases are becoming available for the first time. We analyze data from one of the most paradigmatic tagging systems and focus on tags associated with a given resource. Based on the frequency distribution of tags provided by users, we introduce a notion of (socially emergent) similarity among resources. By using this notion of similarity we study the community structure of the ensuing network and show that communities correspond to semantically separated areas. We relate the semantic community structure to the underlying social network of users of the tagging system.