Comment by BlueTemplar

I don't think it's impossible to enforce, you can probably do it on social media limited to hundred(s) of participants, where moderators (and other users) can get familiar with specific posters.

On most social media people aren't anonymous, they are pseudonymous - this can still have an impact on your behavior when you know that even non-moderators can look up your post history.

But I guess that a lot of posters are still going to feel pseudo-anonymous, because looking up still requires a lot of effort... at least until for a few they become famous enough (dang, pg...) that their pseudo-anonymity is gone.