Developing trust networks based on user tagging information for recommendation making

Authors:
Touhid Bhuiyan;Yue Xu;Audun Jøsang;Huizhi Liang;Clive Cox
Affiliations:
Faculty of Science and Technology, Queensland University of Technology, Australia;Faculty of Science and Technology, Queensland University of Technology, Australia;UniK Graduate School, University of Oslo, Norway;Faculty of Science and Technology, Queensland University of Technology, Australia;Rummble.com, Cambridge, England
Venue:
WISE'10 Proceedings of the 11th international conference on Web information systems engineering
Year:
2010

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Abstract

Recommender systems are one of the recent inventions to deal with ever growing information overload. Collaborative filtering seems to be the most popular technique in recommender systems. With sufficient background information of item ratings, its performance is promising enough. But research shows that it performs very poor in a cold start situation where previous rating data is sparse. As an alternative, trust can be used for neighbor formation to generate automated recommendation. User assigned explicit trust rating such as how much they trust each other is used for this purpose. However, reliable explicit trust data is not always available. In this paper we propose a new method of developing trust networks based on user's interest similarity in the absence of explicit trust data. To identify the interest similarity, we have used user's personalized tagging information. This trust network can be used to find the neighbors to make automated recommendations. Our experiment result shows that the proposed trust based method outperforms the traditional collaborative filtering approach which uses users rating data. Its performance improves even further when we utilize trust propagation techniques to broaden the range of neighborhood.