The Tipping Point...

http://en.wikipedia.org/wiki/The_Tipping_Point
http://en.wikipedia.org/wiki/The_Big_Mo

The collaborative encyclopedia Wikipedia also benefits from a network effect. The theory goes that as the number of editors grows, the quality of information on the website improves, encouraging more users to turn to it as a source of information; some of the new users in turn become editors, continuing the process.

http://en.wikipedia.org/wiki/Network_effect

P.s: La machine nous donne beaucoup d'informations, en remerciant Wikipedia... et des lecteurs. En espérant que ce ne soient pas des robots;)

http://www.youtube.com/watch?v=UaYHRx9-v2M

http://en.wikipedia.org/wiki/Chain_reaction

Remettre la technique à sa place.