What do you think made these common people, with curiosity and intensity to make a change and do so, make what they fought for sustainable? Do you think that the things they fought for is something they have devoted a lot of their life span to doing? Or do you think, especially the woman who made a Facebook page for Obama, will continue to fight for him even this time around?

I believe each case is different because some of these "common" people were not planning on starting a social movement, just express something that bothered them. What made some of these social movements sustainable, was the people around this person who saw that "spark" needed to inspire new followers and join the cause.
Talking about the woman who started the Facebook page for Obama, I am not sure what she would do these days because, I do not know if she is the typical follower who is 100%  blinded and who will not recognize bad decisions her favorite candidate might make, or if she is objective and is able to discern between a good or bad decision.