On the “social web” or “web2.0″, where user participation is entirely voluntarily, User Motivation has been identified as a key factor in the mechanisms contributing to the success of tagging systems. Web researchers are trying to identify the reasons why tagging systems work for a couple of years now, evident in, for example, the organization of a panel at CHI 2006 and a number of conferences and workshops on this topic.
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M. Ames, und M. Naaman. CHI '07: Proceedings of the SIGCHI conference on Human factors in computing systems, Seite 971--980. New York, NY, USA, ACM, (2007)