this is pedantic, but I think its important. We can say that a truth and lie are exclusive. when we lie, we know the truth. we just make up something else because it fits our agenda better. post-truth implies that the distinction doesn't matter anymore. nothing is true, everything is true. no statement can be evaluated outside the intent in which its delivered. that's much more substantial shift than just presenting a set of lies as the truth. a post-truth society is almost compelled to devalue science or any other pursuit of knowledge. by making all the voices selfish and mundane, it explicitly rejects beauty and accomplishment.