Ontology of Folksonomy: A Mash-up of Apples and Oranges Thomas Gruber TomGruber.org and RealTravel.com Published in Int’l Journal on Semantic Web & Information Systems, 3(2), 2007. Originally published to the web in 2005. Summary Ontologies are enabling technology for the Semantic Web. They are a means for people to state what they mean by the terms used in data that they might generate, share, o