2. If so where?
Which leads to, if 1 is yes, what criteria do we use to decide 2?
Simple. Always has been. Officials are elected who have the authority to enforce the wishes of the population and who share their views on what is, or is not acceptable. The population can change the equation easily by changing those who get elected. That formula works very well for a whole bunch of important things. Censorship is no more difficult, nor less important.