Any time you have two people interacting in any way, you have a culture dominated by a constant masquerade. All that's changed now is that you're more aware of it than you were before. I suspect quite strongly that you'll find this to be true in pretty much all of human history. It comes with being a social animal with a theory of mind - we care about and wish to shape how others view us.
> Any time you have two people interacting in any way, you have a culture dominated by a constant masquerade.
Often, but not always. And maybe that's another way to look at this. People are longing for authenticity, both in themselves and their interactions, and all they're getting are Facebook posts. In the non-tech society, you got phoniness, certainly, but you probably got more genuine interactions than you do now.
You got more interactions, but they weren't more genuine. They were every bit as much about building and maintaining an image.
I suspect they were less genuine, on the whole, because you had less ability to opt out and limit yourself to only more genuine interactions. In the non-tech society, keeping up appearances was and is of paramount importance.