If you are yelling or distributing pamphlets in my backyard and I don't like the message, and I ask you to move, I'm not sure you would refer to it as "censorship".
Sure, that would be you censoring certain types of speech on your property.
It would have a pretty small effect on other people's ability to engage in speech. But it is an effect none the less.
If you owned a huge amount of property, though, then this would be a larger amount of censorship.
We agree then, this is "censorship", but has nothing to do with "freedom of speech" as codified in US law.
> but has nothing to do with "freedom of speech"
It absolutely has something to do with the general concept of freedom of speech, actually.
Freedom of speech is a concept, not just a law.
Feel free to argue that Facebook should be allowed to censor others. But it is still censorship.
It is perfectly possible for someone to both think that Facebooks actions should be allowed, and are also censorship at the same time.