From September 2005 to June 2006 a team of thirteen scholars at the The University of Southern California's Annenberg Center for Communication explored how new and maturing networking technologies are transforming the way in which we interact with content, media sources, other individuals and groups, and the world that surrounds us.
This site documents the process and the results.
Daniel Terdiman's C|Net article 'Tagging' gives Web a Human Meaning is a good introduction to the importance of folksonomies and tagging for anyone looking for such a thing.
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