I've filed support tickets with Oculus using my own headset's serial number - no response. We've been through every Facebook "help" page you can possibly image (ID checks, hacked account support, responding to security alerts) - got automated responses of absolutely no help. I've even reached out to people I know personally who work at Facebook and, of course, no one seems to have any idea who to talk to.
Turns out there are no support reps for dealing with deleted accounts. That should tell you all you need to know.
Did that ever happened on Facebook? Anecdotally I have 2 FB accounts that I haven't posted to in years, and they are still alive.
PS: I suggest reading the link GP posted.
In case you don't, here's a summary: a newly account created FB account only used to use an API was deleted. This is a far cry from "deleting your account because you didn't post enough statuses or photos of your kid".
Since then I have used Wit.ai services for 8 months without issues, then two weeks ago my Facebook account has suddenly disappeared. The account no longer exists when I try to log in, it is not limited or disabled, it's gone, without notice.
Wit.ai apps have a state, they host intents and the ML models are continuously trained based on your input. All of that data is now lost, and I haven't even received an email.