TY - CONF AU - Au Yeung, Ching Man AU - Noll, Michael G. AU - Gibbins, Nicholas AU - Meinel, Christoph AU - Shadbolt, Nigel A2 - T1 - On Measuring Expertise in Collaborative Tagging Systems T2 - WebSci'09: Web Science Conference 2009 - Society On-Line, Athens, Greece, 18-20 March, 2009 PB - CY - PY - 2009/03 M2 - VL - IS - SP - EP - UR - http://journal.webscience.org/109/ M3 - KW - systems KW - experts KW - expertise KW - spear KW - evidnet KW - tagging L1 - SN - N1 - N1 - AB - Collaborative tagging systems such as Delicious provide a new means of organizing and sharing resources. They also allow users to search for documents relevant to a particular topic or for other users who are experts in a particular domain. Nevertheless, identifying relevant documents and knowledgeable users is not a trivial task, especially when the volume of documents is huge and there exist spamming activities. In this paper, we discuss the notions of experts and expertise in the context of collaborative tagging systems. We propose that the level of expertise of a user in a particular topic is mainly determined by two factors: (1) there should be a relationship of mutual reinforcement between the expertise of a user and the quality of a document; and (2) an expert should be one who tends to identify useful documents before other users discover them. We propose a graph-based algorithm, SPEAR (SPamming-resistant Expertise Analysis and Ranking), which implements the above ideas for ranking users in a collaborative tagging system. We carry out experiments on both simulated data sets and real-world data sets obtained from Delicious, and show that SPEAR is more resistant to spammers than other methods such as the HITS algorithm and simple statistical measures. ER - TY - JOUR AU - Özsu, M. Tame AU - Liu, Lin T1 - Encyclopedia of database systems JO - PY - 2009/ VL - IS - SP - EP - UR - http://www.worldcat.org/search?qt=worldcat_org_all&q=9780387496160 M3 - KW - database KW - encyclopedia KW - systems L1 - SN - 9780387399409 0387399402 9780387355443 0387355448 N1 - Encyclopedia of Database Systems N1 - AB - ER - TY - CONF AU - Krause, Beate AU - Schmitz, Christoph AU - Hotho, Andreas AU - Stumme, Gerd A2 - T1 - The Anti-Social Tagger - Detecting Spam in Social Bookmarking Systems T2 - Proc. of the Fourth International Workshop on Adversarial Information Retrieval on the Web PB - CY - PY - 2008/ M2 - VL - IS - SP - EP - UR - http://airweb.cse.lehigh.edu/2008/submissions/krause_2008_anti_social_tagger.pdf M3 - KW - 2008 KW - systems KW - bookmarking KW - web KW - tagger KW - 2.0 KW - itegpub KW - social KW - web2.0 KW - folksonomy KW - folksonomies KW - tagorapub KW - spam L1 - SN - N1 - N1 - AB - ER -