On Tor, Freenet and all the other technologies generally thought of as the dark web, there's a forum or discussion thread or chan for every weird, violent, and/or illegal thing you can imagine. I've found things I could not imagine until I saw them. The notion that someone would brag about their plans to commit a mass shooting at a movie, in those contexts, sounds almost quaint and innocent compared to the stuff that's often posted with pictures, video, and documentation.I read somewhere they found someone making threats (bragging) about a shooting on the dark web. I've never been on the dark web, so I'm not really sure if there's a forum or something for such threats/bragging.