because it took me 10 minutes to find it. every "how to" just copies facebooks fucking useless help page.
maybe this will get indexed by yandex oneday lol
https://accountscenter.facebook.com/personal_info/account_ownership_and_control/deletion_and_deactivation/?is_from_dialog=true
This is the correct way to wipe out an internet account. Get all your info off first.
Facebook has also been confirmed to create "shadow" accounts of people that fit into holes in their web of social networks. Honestly, your best bet may may to just delete everything from your account but not your account itself to maintain at least a little control over who "you" are to Facebook.