I haven't logged in to Facebook for about three years. When that 'off-Facebook data we have on you' page was released recently, I worked up the courage* to try to login, see it, and then finally 'delete' my account.

(*I've been slightly concerned that it will be depressing one way or the other, either three years' messages and invitations to things I missed, or little of that! Since I just sort of stopped logging in, I never posted that I wasn't using it for example.)

But I couldn't login. Facebook wanted me to prove my identity by contacting a set of my 'friends' that it chose, and I had no idea who they were. The only other option was to upload a scan of my passport, which felt a bit much considering my only aim was to get off properly and be appalled at the data it already has on me.