They're really not -- or shouldn't be. Certainly not when you have a textualist/originalist majority on the court charged with deciding what is and isn't constitutional.

I get your broader point that societies and norms change. But the last thing any of us should want is a constitution that is lightly referenced and broadly interpreted because history shows such easily interpreted and changed documents benefit the oppressor far more than the oppressed.

Your final point is a strong one: Substantial parts (and, for some forms of speech, nearly all parts) of our freedom of speech runs through a handful of large social -media companies. There's little reason that can't be addressed with appropriate federal legislation but, if that's not enough, then let's get on with the heavy lift of actually amending the Constitution, rather than hoping our better angels prevail in interpreting it.