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In this paper, the authors propose a novel recommender framework for P2P file sharing systems. The proposed recommender system is based on user-based collaborative filtering technique. They take advantage from the partial search process used in partially decentralized systems to explore the relationships between peers. The proposed recommender system does not require any additional effort from the users since implicit rating is used. To measure the similarity between peers, they investigate similarity metrics that were proposed in other fields and adapt them to file sharing P2P systems. They analyze the impact of each similarity metric on the accuracy of the recommendations. Files' recommendations will increase users' satisfaction since they will receive recommendations on files that they prefer.
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