Does FB put in writing somewhere that deleting your account will result in all your data, including inferences and profiling data derived from data you and others have provided will be actually purged from their systems? Or do they just delete what little personal data you may have provided directly, but could still reconstitute virtually everything about you, whether anonymized or re-linked upon request or payment by a third party?
Search for "deleted" in https://www.facebook.com/full_data_use_policy. The bit you'd be worried about is: Keep in mind that information that others have shared about you is not part of your account and will not be deleted when you delete your account.
It's not obvious to me that other people's comments should be deleted or modified because they mention you. What if they mention you again after you've left?
