"Dear Twitter Followers, It is with grave heart that I have to ask you to do the right thing for your country, go out and do something about - insert bogeyman of the hour here - and I will be sure to reward you greatly. The time has come to do your part. I personally promise to pardon anybody that ends up on the wrong side of what today still is the law. Let's take this country and make it even greater."
That's just a two minute sample, give me an hour or so and I'll come up with something much worse than that. These things are easier to start than to stop.