One, the worldview embedded into your comment, is that freedom is about the limits of discourse. Under this system, limiting discourse is inherently undemocratic, so if facebook "censor(s) things they disagree with" this is bad and we don't need any analysis of what specifically the discourse was to make our determination, which is why your comment abstracts over any value it could be. Full disclosure, I don't fully understand this worldview because it seems to enforce a particular discourse on Mark Zuckerberg, which seems a bit contradictory to me although I assume there must be some way philosophically to resolve this objection.
The other worldview is that certain kinds of discourse are inherently against freedom. For example, misinformation that might persuade voters into voting based on a false premise undermines a democratic system. Under this worldview, the question of what the discourse is, is the whole analysis, and we don't need any analysis of what Zuckerberg "disagrees with" to decide if it's right to limit. Obviously the people who will advocate for removing a discourse are people who don't like it, but that's separate from analysis of whether the discourse itself is a force against democracy.
These ideas are at cross purposes, and success of the one is often at the expense of the other. For this reason we seem reluctant to just lay out the underlying value systems the way I did here, which is unfortunate, because I think the fundamental disagreement is really important to discuss.