There's some serious equivocation going on here around the ownership of the data. It's your data; you own copyright on it. Per the TOS, you grant them an "irrev

There's some serious equivocation going on here around the ownership of the data. It's your data; you own copyright on it. Per the TOS, you grant them an "irrevocable, royalty-free license" to do things with the data. (The set of things they can do with the data is subject to change, with notification, but if those changes are "adverse" to you, you have the right to revoke that consent. What happens to your data after that consent is revoked is something that probably needs to be explored legally, but it's pretty widely known that Facebook never actually deletes anything. And the TOS do say "irrevocable", after all...) All that said, it's not their data. (Effectively) unlimited access, yes; ownership, no.