UPDATE: A BGR commenter has posted the full account reactivation instructions users are seeing when their accounts are disabled:
Please upload a government-issued ID to this report and make sure that your full name, date of birth, and photo are clear. You should also black out any personal information that is not needed to verify your identity (e.g., social security number).
If you do not have access to a scanner, a digital image of your photo ID will be accepted as well. Rest assured that we will permanently delete your ID from our servers once we have used it to verify the authenticity of your account.
Again — if your account was affected, please do not follow any instructions like the ones above until Facebook has verified that these account deactivations are not the result of an attack.
UPDATE 2: Facebook has responded to BGR‘s request for comment.
Thanks Brian, and everyone else who sent this in!