However if you are sure, and want everything to be removed (photos, comments, etc.)
How to permanently delete your Facebook account. Irretrievably!
http://www.facebook.com/help/contact.php?show_form=delete_account
Warning! There is no return from this procedure.
Note: this procedure has reportedly not worked (Thanks Ivo), and so you may want to simply delete all images, texts, applications and then deactivate the account. (Thanks Sonya)
