[bzbarsky]

If you delete your account on Facebook, I would think that it doesn't delete various information it stores about your social graph and various metainformation about you. And I would think that because it maintains that information for you even if you don't have an account. See https://www.dailydot.com/news/facebook-shadow-profiles-priva... for a brief rundown. I have yet to see any proof, or indeed any claims, to the contrary by Facebook.

Similarly, you can delete your emails from Gmail and your calendar data from Google calendar, but you cannot delete the metainformation consisting of their tracking data and so forth.

Which is what privacypoller was saying: you can remove _your_ access to some of this stuff, but you can't remove all the information they are collecting about you.