What’s a “preference cascade?” It’s people who believed they were alone in their beliefs who suddenly find out that they are part of a much larger group. It’s human nature to not want to be an oddball. It’s human nature not to want to be a one-man revolution. It’s when you find out that most of the people around you share your views that revolutions are made.
It’s perfectly illustrated by a post by Glenn Reynolds explaining how revolutions seem to appear out of nowhere.
Read the rest here. It's really quite interesting.