Something that's particularly interesting; on Pod Save America, they referenced a study (which I forget right now) that tracked protest effectiveness vs size, and right around the time that twitter/facebook started taking off, protest size skyrocketed while protest effectiveness plummeted.

As it turns out, social media short-circuited traditional methods of organizing. Those traditional methods of organizing, ie, actually knocking on doors and talking with your neighbours, were also the social glue that formed civic groups which did stuff after the protest ended, like voter drives or lobbying politicians, political tactics which actually worked.