We need to look at websites as service providers/data carriers akin to telcos. The government has issued a slew of regulations to prevent artificially strong network lock-in with telcos, mandating wireless number portability and certain levels of device compatibility.
We need to recognize that Facebook is not a content creator as such, but a neutral carrier who transmits the data generated by its users, and that the users need their freedom and mobility to be respected if we're going to have a free and competitive market in cyberspace. There is no good reason that Facebook or Google should have such excessive unnatural ownership and access blockage rights.
n.b.: I say this as someone who is very conservative politically. Intellectual property is a government-granted monopoly that we have let run far afield.
I don't resent property ownership in the slightest, nor do I resent profit-making. I do resent an oligopoly exploiting regulatory capture and public technical ignorance (cf. Clarke's Law) to pass laws that allow them to arbitrarily and brutally crush innovative and competitive entrepreneurs.