> Automatic censorship of live feeds, how do you do that?

Make it live but with a time delay (say 1 hour). Allow .1% of all users to see it immediately. Add a Flag This Content button. Depending on how many people flag it, triage as safe to show/don't show/ask a human to decide.

I'm sure this could be refined. Maybe an hour is too much or too little. Maybe .1% is to many or too few. Also, over time you should be able to recognize groups of users that are better at recognizing different problems based on the fact that they agree with the human review done by fb or whoever.