After analyzing a large amount of social annotations, we found that tags are usually semantically related to each other if they are used to tag the same or related resources for many times. Users may have similar interests if their annotations share many
A. Rae, B. Sigurbjörnsson, and R. van Zwol. Adaptivity, Personalization and Fusion of Heterogeneous Information, page 92--99. Paris, France, Le Centre De Hautes Etudes Internationales d'Informatique Documentaire, (2010)
K. Siorpaes, and M. Hepp. Proceedings of the 5th European semantic web conference on The semantic web: research and applications, page 751--766. Berlin, Heidelberg, Springer-Verlag, (2008)