Tags vs Shelves: From Social Tagging to Social Classification

My paper with Christian K├Ârner and Markus Strohmaier entitled “Tags vs Shelves: From Social Tagging to Social Classification” has been accepted for publication and presentation at HT 2011, the 22nd ACM Conference on Hypertext and Hypermedia to be held in Eindhoven, Netherlands, from June 6 to 9, 2011.


Recent research has shown that different tagging motivation and user behavior can effect the overall usefulness of social tagging systems for certain tasks. In this paper, we provide further evidence for this observation by demonstrating that tagging data obtained from certain types of users – so-called Categorizers – outperforms data from other users on a social classification task. We show that segmenting users based on their tagging behavior has significant impact on the performance of automated classification of tagged data by using (i) tagging data from two different social tagging systems, (ii) a Support Vector Machine as a classification mechanism and (iii) existing classification systems such as the Library of Congress Classification System as ground truth. Our results are relevant for scientists studying pragmatics and semantics of social tagging systems as well as for engineers interested in influencing emerging properties of deployed social tagging systems.


Category: research, social-bookmarking, social-tagging

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- April 26, 2011

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