Farooq, Umer, Kannampallil, Thomas G., Song, Yang, Ganoe, Craig H., Carroll, John M. and Giles, Lee. "Evaluating tagging behavior in social bookmarking systems: metrics and design heuristics." Paper presented at the meeting of the GROUP '07: Proceedings of the 2007 international ACM conference on Conference on supporting group work, New York, NY, USA, 2007.