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Telephony, Internet, are open technologies without locking you in as a customer for any company.No, they are natural local monopolies. It takes explicit effort in policy making to avoid actual monopolies. The result is mixed: while it is possible to change your provider, it is much less convenient than changing the theatre you will go to next time. Switching costs aren't negligible. And in the US, I hear you have only two provider at any given place: the DSL provider, and the cable provider.
As you suggest, there is nothing wrong with Facebook wanting to monetize human interactions. The problem is how they do it. If they charged their user for the service, and didn't bother them with ads and constant spying, that would be fine. Heck, they could even prevent most spying and cut down the server costs by selling little servers you could plug into your home, have them talk peer-to-peer, and charge for updates or something.
But no, they had to violate our most intimate conversations constantly. Okay, maybe not the most intimate (those actually go through Gmail), but you get the idea. That is what's wrong with Facebook (and Google, and Apple…). Not charging for the service, but the hidden costs, the spying, and other totalitarian artefacts.