Now, the real breakthru of folksonomical-based systems like del.icio.us or flickr is not the lack of structure or commitee-based design in the ontological space, but is the idea that if two people use the same term, it's more probable than they meant the same thing than they meant different things.
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H. Kim, S. Scerri, J. Breslin, S. Decker, und H. Kim. Proceedings of the 2008 International Conference on Dublin Core and Metadata Applications, Seite 128--137. Berlin, Deutschland, Dublin Core Metadata Initiative, (2008)