Growing a tree in the forest: constructing folksonomies by integrating structured metadata.
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KDD, page 949-958. ACM, (2010)

Many social Web sites allow users to annotate the content with descriptive metadata, such as tags, and more recently to organize content hierarchically. These types of structured metadata provide valuable evidence for learning how a com- munity organizes knowledge. For instance, we can aggre- gate many personal hierarchies into a common taxonomy, also known as a folksonomy, that will aid users in visualiz- ing and browsing social content, and also to help them in organizing their own content. However, learning from social metadata presents several challenges, since it is sparse, shal- low, ambiguous, noisy, and inconsistent. We describe an ap- proach to folksonomy learning based on relational clustering, which exploits structured metadata contained in personal hierarchies. Our approach clusters similar hierarchies using their structure and tag statistics, then incrementally weaves them into a deeper, bushier tree. We study folksonomy learning using social metadata extracted from the photo- sharing site Flickr, and demonstrate that the proposed ap- proach addresses the challenges. Moreover, comparing to previous work, the approach produces larger, more accurate folksonomies, and in addition, scales better.
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