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Retrieval effectiveness of tagging systems.

, , , and . Heinrich-Heine-University, Heinrich-Heine-University Department of Information Science Universitätsstraße1, 40225 Düsseldorf, Germany, (October 2011)

Abstract

Social tagging is a widespread activity for indexing user-generated content on Web services. This paper summarizes research on folksonomies and their retrieval effectiveness. A TREC-like retrieval test was conducted with tags and resources from the social bookmarking system delicious, which resulted in recall and precision values for tag-only searches. Moreover, several experimental tag-based databases (i.e., power tags, Luhn-tags) have been tested regarding their retrieval effectiveness. Test results show that folksonomies work best with short queries although recall values are high and precision values are low. Here, a search function “power tags only” greatly enhances precision values.

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