Pressure is building on social media sites to suppress "hate speech" and other unpleasantness. As a result, platforms that once promised open association and robust conversations are turning into snitch societies and mob-justice platforms. The recent drama involving James Gunn provides a particular case in point. The director of the first two blockbuster Guardian of the Galaxy films recently found himself booted from the third film by Disney for tweets he posted years ago about pedophilia, rape, 9/11, AIDS, and the Holocaust.