The New School of Ontologies: "These "bags of keywords" are known by many names. Flickr, Del.icio.us, and Google's GMail call them "tags". Blog authoring and CMS software often call them "categories". Information architects typically call them "facets"."
Jesus Christ, facets are misunderstood. See also this. The original wikipedia entry for folksonomies even said something like that facets are closely related to tags. Sillyness, really.
Merging facets and folksonomies isn't hard, I'll demonstrate in 2 months (more or less) when the new Mefeedia goes live.
# May 1, 2005