%0 Conference Paper %1 laniado2007using %A Laniado, David %A Eynard, Davide %A Colombetti, Marco %B Semantic Web Application and Perspectives - Fourth Italian Semantic Web Workshop %D 2007 %K folksonomy ol_web2.0 ontology wordnet enrichment %P 192--201 %T Using WordNet to turn a folksonomy into a hierarchy of concepts %U http://home.dei.polimi.it/eynard/papers/swap2007.pdf %X As the volume of information in the read-write Web increases rapidly, folksonomies are becoming a widely used tool to organize and categorize resources in a bottom up, flat and inclusive way. However, due to their very structure, they show some drawbacks; in particular the lack of hierarchy bears some limitations in the possibilities of searching and browsing. In this paper we investigate a new approach, based on the idea of integrating an ontology in the navigation interface of a folksonomy, and we describe an application that filters del.icio.us keywords through the WordNet hierarchy of concepts, to enrich the possibilities of navigation.