I don't disagree with you at all, but just to play devil's advocate, I suppose the argument could be made that Facebook has basically created a near-monopoly in the social media space, and if that's the case maybe they should be viewed as a "utility" than a regular unregulated business. For example, I don't think Con Edison [1] could kick me off my electricity (assuming I was paying my bill), even if I handed out pamphlets saying how to use less power, since Con Edison is a regulated utility.

Obviously this isn't a great comparison, you could make a much stronger argument for a "necessity" of electricity than a platform to share photos with friends, but that argument could be made that because of the ubiquity of Facebook (and subsidiaries), maybe they should be a free speech zone.

[1] NYC's biggest power company.