It seems like there are two major hurdles. First people need to be informed about history and reality to really see why having Facebook and the government decide what is true or not is a bad idea.
The second big hurdle is, we actually do need to do _something_ to reduce the amount of wanton spread of disinformation and propaganda by many groups online. It's not as easy as many people think it is, because unfortunately all governments and large companies do it quite a bit, and having those types of institutions simply dictate reality is just as bad as for example, having Amazon have complete control of the product listings on its site when they also market competing products. It's the fox guarding the hen house.