This poster describes our study of user-induced hyperlinks found in folksonomies using association rule mining algorithms. We compare these induced hyperlinks with existing hyperlinks found among the same set of documents. Our experiments show that user-induced hyperlinks are very different in nature from existing hyperlinks. They tend to connect documents from different domains and documents that are highly related to each other as judged by the similarity between the tags assigned to them. Our study suggests that user-induced hyperlinks in collaborative tagging systems are very valuable in complementing the existing link structure on the Web to help users navigate between highly related Web documents
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