Fundamentally, policing of speech can happen at one of two points: before content disseminates, or after. Policing content after it disseminates involves human agents seeing and reporting content and taking action or requesting action. This can happen on a huge scale or a tiny one: Facebook’s content flagging system, obscenity law in much of the EU and USA, parents who object to books assigned in schools, and China’s 50 Cent Army of two million internet censors, all these act to silence content after it disseminates.