It's different now though... "publish" means much more than it used to. Now, if you want to share a picture with a few friends, that means "publishing" it on Facebook/IG/etc... It's no longer just a physical photo that is controlled by you. By moving personal interactions online, you lose a lot of control and things that used to be temporary are now permanent. I don't think that it's possible to put this genie back in the bottle, so the next best thing would be to have different levels of data permanence.
And by saying that, do not you get a vibe that makes you go "Wait a minute there...".
> different levels of data permanence
It makes more sense to discriminate "personal common spaces" and "The Public Statements of Sam Artist / of Noam Thinker / of Henry Statesman / of Theodor Ruler".