You shouldn't be free to incite violence. Nor should a company help that speech spread.
only the fringiest of fringes argue for absolutes. everyone (else) is arguing about where the line is drawn. for instance, if we take yours at face value, you'd be arguing against the american revolution.
> "In Brandenburg, the US Supreme Court referred to the right even to speak openly of violent action and revolution in broad terms"
no one is breaking any rules or laws here, as far as the constitution is concerned.
but see, that's all beside the point regarding facebook. they have no binding legal requirement to that same standard of free speech. the debate there is how much corporate censorship people are willing to tolerate without injury to facebook's bottom line and stature.