> I think something that's become clear with propaganda is that it scales extremely well.If this is indeed a problem, it's not a problem that's fixable by controlling the supply of propaganda (which for this discussion I am assuming to mean something like "false information that nevertheless convinces a lot of people of its truth"). It's only fixable by controlling the demand for propaganda--in other words, by reducing the number of people who can be convinced by it.
To look at it another way: trying to control the supply of propaganda means some authority has to have the power to judge that certain statements are propaganda and suppress them. How does that authority decide what is propaganda and what isn't? All you've done is transfer the propaganda problem to that authority, and that might make it, if anything, even harder to solve. Propaganda spread by Facebook posts and tweets is one thing. Propaganda spread by a recognized authority, especially under the guise of controlling propaganda spread by someone else, is quite another.
The only way out of this trap is for people to stop being convinced by anything that they cannot convince themselves of using their intelligence, common sense, and critical thinking skills.