How to permanently delete a Facebook account?

[v]

You can actually download all your stuff from Facebook.
http://www.facebook.com/help/?page=116481065103985

That being said, you can "deactivate" your account afterward, but you can't delete it.
I.E: Hide your account from everyone else as if it doesn't exist anymore. . . to reactive, simply log in again.
http://www.facebook.com/help/214376678584711/


Furthermore, anything that you have ever posted on Facebook cannot be deleted in anyway. So if you post a comment, and then delete it afterwards. . . while you and your friends won't see it again, a copy of your deleted comment WILL BE STORED IN A FACEBOOK SERVER SOMEWHERE.

A while ago I remember reading about a police investigation where the police asked Facebook about posts and information Facebook has about a suspect in crime. Facebook supplied a full report of anything that the suspect has EVER posted.