Nice Post.
User can delete their account permanently if he wants. But there is an another option like deactivate Facebook account through which user can deactivate their Facebook account for sometime which is helpful in future. For delete and deactivate their account read this post given below and also follow these. For any other query you can contact to the FB toll free number +1-888-259-9422.
http://igurus-inc.net/how-to-delete-or-deactivate-facebook-account/