In a previous essay, I wrote about the cognitive aspect of tagging - describing how people tag, and why they find it easy. There is another, equally important aspect of tagging that I did not touch upon - the "why" of tagging. Why do people tag? For many,
B. Krause, R. Jäschke, A. Hotho, and G. Stumme. HT '08: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia, page 157--166. New York, NY, USA, ACM, (2008)