Hall's quote from "The Friends of Voltaire" describes Voltaire's views concerning the revoking of Helvétius's right to publish De l'esprit, its ban in Rome, and more. By my reading, Hall doesn't imply that Voltaire meant to also 'defend to the death' the right for Helvétius to force a given company to publish his book - something which wasn't needed as it was quickly re-published across Europe.

Caesar has crossed this Rubicon so many times there's a 4-lane highway with a Waffle House at the rest stop. Forum moderators have been exercising their right of free association for a long time.

Why would Twitter (and FB) agree to be regulated as common carrier, with limited ability to discriminate in its service to the general public? What should it/they get in exchange?