I'd like to add that in the sixties most of the big marches were against the Vietnam War. I think the thing that feuled those marches, besides the fact that young people like to socialize, was that the young men back then had a very real fear of getting killed in Vietnam. When they got rid of the draft the marches disappeared, too. The war lumbered on half-heartedly a few more years. What you got to do today to get people motivated is to make them think their lives are on the line one way or the other. Or perhaps there is no way to get the Cell Phone/Facebook generation to get protesting. Maybe if the economy gets even crappier, then the people will revolt. If we get so poor that we cannot own a cell phone or a computer, then we might see some action. Which dovetails back to your premise that Cell Phones and Social Media are the new Opiates of the People.