You do not have free speech on social media today, private platforms decide what they want to have.
The state does not have to be the one to decide these things, nor is it a case of “deciding” what is true, we have a long history of using proofs to solidify something as fact, or propaganda, or somewhere in between. This is functionally what history studies are about.
They have one, but you also want information to be where people are. Especially if where people are is full of misinformation and rumours.