Online Demos


CTag is a system that efficiently obtains the semantic meanings and contexts of social tags within a particular folksonomy, and exploits them to create semantically contextualised tag-based user and item profiles.

The following are links to CTag online context viewer and profile bilder (recommended Web browsers: Firefox, Safari and Chrome, on MS Windows).

Web Services

CTag Context Service

CTag Contextualised Profile Service


The datasets have been released in the framework of the 2nd International Workshop on Information Heterogeneity and Fusion in Recommender Systems (HetRec 2011)

  • MovieLens-IMDb-RottenTomatoes
  • Delicious