Some say it would set a dangerous precedent, but I still like the internet blackout idea. Riot starts, when it gets going suddenly cell signal and all internet goes out in that area. Law enforcement comes in, rounds everybody up, confiscates phones and recording devices as evidence. Charges are pressed, and people are locked up without playing into the propaganda. Embed reporters to cover the roundup if you want, but charge ALL the rioters. Lock them up, no bail. They are after all dangerous.