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Where does it say that facebook is disabling new user authorizations? I don't see it on the page OP linked.

It's not mentioned in the post specifically, but this is what you get when a new user tries to login with Facebook: https://imgur.com/a/iAf6r

It sounds like this might only affect apps requesting the "pages_messaging" scope... https://twitter.com/search?f=tweets&vertical=default&q=platf...