@article{golder2006,
	title = {{Usage patterns of collaborative tagging systems}},
	author = {S.A. Golder and B.A. Huberman},
	journal = {Journal of Information Science},
	number = {2},
	pages = {198},
	volume = {32},
	year = {2006},
	biburl = {http://www.bibsonomy.org/bibtex/2281943ad0a7c81ad975f0a4c7de43447/wnpxrz},
	description = {introduces different categories of tags (eg task-organising, categories, etc)},
	keywords = {collaborative tagging }
}