does that stop facebook from collecting data about you? I didn't think it did, and because you don't have an account it's not, or at least wasn't possible to control any privacy settings.
Technically, no. Legally, it means you haven't accepted their terms of service, so if/when (I hope) the political privacy landscape changes, it'll be more likely that you can sue, report a violation, request deletion, (or maybe they'd even preemptively delete it to cover their tracks / come into compliance with new laws).
That's an interesting thought. I've removed (deleted?) my Facebook account several months ago. Maybe I should have kept it around in order to manage it.