The SCOT(Social Semantic Cloud Of Tags) ontology is to semantically represent the structure and semantics of a collection of tags and to represent social networks among users based on the tags.
F. Belém, E. Martins, T. Pontes, J. Almeida, and M. Gonçalves. Proceedings of the 34th international ACM SIGIR conference on Research and development in Information Retrieval, page 1033--1042. New York, NY, USA, ACM, (2011)
S. Rendle, and L. Schmidt-Thieme. Proceedings of the third ACM international conference on Web search and data mining, page 81--90. New York, NY, USA, ACM, (2010)
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)
B. Sigurbjörnsson, and R. van Zwol. WWW '08: Proceeding of the 17th International Conference on World Wide Web, page 327--336. New York, NY, USA, ACM, (2008)
A. Shepitsen, J. Gemmell, B. Mobasher, and R. Burke. RecSys '08: Proceedings of the 2008 ACM conference on Recommender systems, page 259--266. New York, NY, USA, ACM, (2008)
C. Veres. Natural Language Processing and Information Systems, volume 3999 of Lecture Notes in Computer Science, page 58--69. Berlin/Heidelberg, Springer, (2006)
P. Chirita, S. Costache, W. Nejdl, and S. Handschuh. WWW '07: Proceedings of the 16th International Conference on World Wide Web, page 845--854. New York, NY, USA, ACM, (2007)