http://www.oster-lundqvist.com/karsten/blog/index.php?entry=/2006-10-07.txt

It seems to me that folksonomies are way too vague in the semantics department. They are very valuable in describing the “world”, because they are produced by the collective, however there simply is a lag of semantic meaning in the way they are described in the data. Hence there is a need for a “tag ontology” which describes the semantic relations between the elements in the folksonomy. This would allow automation from free text, images, video etc. to aggregated semantics based applications, such as search, comparison, and translations. This is simply not possible with standard standalone folksonomies…