The gravity has further shifted to sites featuring online video and entertainment especially among very young target groups. BBC brought an excellent special about online video and the future of TV:
T. Herrmann, K. Loser, and I. Jahnke. The Learning Organization. The international journal of knowledge and organizational learning management., 14 (5):
450--464(2007)Special Issue: On sharing knowledge: sociotechnical approaches. Guest Editors: Alex Ramirez and Elyne Coakes..
T. Herrmann, G. Kunau, and K. Loser. HICCS 2007 the Fortieth Annual Hawaii International Conference, page 232 -- 241. (2007)electronically published on Systems Sciences: http://www.hicss.hawaii.edu/diglib.htm.