Investigating the Properties of a Social Bookmarking and Tagging Network

Ralitsa Angelova, Marek Lipczak, Evangelos Milios and Pawel Pralat
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Ralitsa Angelova: Max Planck Institut für Informatik, Germany
Marek Lipczak: Dalhousie University, Canada
Evangelos Milios: Dalhousie University, Canada
Pawel Pralat: Dalhousie University, Canada

International Journal of Data Warehousing and Mining (IJDWM), 2010, vol. 6, issue 1, 1-19

Abstract: Social networks and collaborative tagging systems are rapidly gaining popularity as a primary means for storing and sharing data among friends, family, colleagues, or perfect strangers as long as they have common interests. del.icio.us3 is a social network where people store and share their personal bookmarks. Most importantly, users tag their bookmarks for ease of information dissemination and later look up. However, it is the friendship links that make del.icio.us a social network. They exist independently of the set of bookmarks that belong to the users and have no relation to the tags typically assigned to the bookmarks. To study the interaction among users, the strength of the existing links and their hidden meaning, we introduce implicit links in the network. These links connect only highly “similar” users. Here, similarity can reflect different aspects of the user’s profile that makes her similar to any other user, such as number of shared bookmarks, or similarity of their tags clouds. The authors investigate the question whether friends have common interests, they gain additional insights on the strategies that users use to assign tags to their bookmarks, and they demonstrate that the graphs formed by implicit links have unique properties differing from binomial random graphs or random graphs with an expected power-law degree distribution.

Date: 2010
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