"This study surveyed the folksonomy as a complex network. The result indicates that the network, which is composed of the tags from the folksonomy, displays both properties of small world and scale-free."
S. Lee, S. Yook, Y. Kim, S. Yoon, H. Kim, D. Lee, and Y. Ko. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)