Given how much it’s talked, tweeted about and worried over, you’d think we’d know a lot about fake news. And in some sense, we do. We know that false stories posing as legitimate journalism have been used to try to sway elections; we know they help spread conspiracy theories; they may even cause false memories. And yet we also know that the term “fake news” has become a trope, so widely used and abused that it no longer serves its original function.
Why is that? And why, given all our supposed knowledge of it, is fake news — the actual phenomenon — still effective?