The term first coined at a conference brainstorming session between O'Reilly Media and MediaLive International, which also spawned the Web 2.0 Conference.
P. Pirolli, E. Wollny, and B. Suh. CHI '09: Proceedings of the 27th international conference on Human factors in computing systems, page 1505--1508. New York, NY, USA, ACM, (2009)
A. Rivadeneira, D. Gruen, M. Muller, and D. Millen. CHI '07: Proceedings of the SIGCHI conference on Human factors in computing systems, page 995--998. New York, NY, USA, ACM Press, (2007)