You've seen nasty posts on Facebook and other social media. Perhaps you've posted a few - ahem - regrettable things yourself. Can one of those posts put you in the slammer?The answer is yes. If you post something called a "true threat," you may find yourself in handcuffs. But how do we define a "true threat?" That's what Anthony Elonis is arguing about, right now, in the United States Supreme Court.Join us! And, in the meantime, be nice.