Folksonomies

I had to look this word up. This what Google found for me, in case anyone else wasn't familiar with that word either:

Definitions of Folksonomies on the Web:

Are collaboratively generated, open-ended labeling systems that enables Internet users to categorize content such as Web pages, online photographs ...www.infodiv.unimelb.edu.au/metadata/glossary.html

The tagging of content with metadata or information by users and community members based on their personal preferences. Folksonomies allow any user to add comments or information that other users can take advantage of when looking for or organizing their own information. ...plc.fis.utoronto.ca/tgdemo/Glossary.asp