Social bookmarking services enable users to share, manage, and search bookmarks. Bookmarks can be organized by annotating them with tags. A deeper understanding of tagging behavior across social media would help in tag usage modeling, tag recommendation, and cross-media user information integration. In this study, we perform a cross-site study of user tagging behavior in two popular social bookmarking sites, StumbleUpon and Delicious. Our study suggests that user behavior significantly varies across sites, thus, shedding light on the future development of tag usage modeling and recommendation across social media
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