[JumpCrisscross]

> You don't have a constitutional right to post on Facebook

Which is why OP describes the U.S. enacting legislation creating a statutory right.

[montroser]

You are correct. But it's a ridiculous suggestion. Can you imagine the local corner store with a bulletin board, and some patron tacks up a picture of a swastika, and the owner of the store is not allowed to take it down?

[prasadjoglekar]

Au contraire, enacting such a law is akin to forcing FB to support certain speech. That itself is unconstitutional and any such legislation would be struck down.