If you're given the right to control what Facebook has the right to censor, then you're actually removing Facebook's freedom of expression. After all, their code and their website is a form of expression of their own, despite being composed in part by users' content.

The problem that exists with Facebook is actually just a symptom of another, largely unspoken problem; Facebook has a monopoly, and this monopoly gives them unprecedented influence over the population.

Getting to the bottom of things is important, because the bandage that addresses the symptom you're describing is the tyranny you fear.