How do I delete my Facebook account?
It’s not as easy to find out how to delete your account. I clicked on the Account tab and then Help Center and typed in “delete account” in the search window. Under the question prompt “How do I permanently delete my account” there is a link to the page where you can click the Submit button or the Cancel button (Click or Copy and paste):
https://ssl.facebook.com/help/contact.php?show_form=delete_account&__a=17

What happens to my data after I delete my account?
According to this Facebook Help Center page all personally identifiable information associated with your account will be purged from Facebook’s database if you choose to permanently delete the account. “This includes information like your name, e-mail address, mailing address, and IM screen name,” the site says. “Copies of some material (photos, notes, etc.) may remain in our servers for technical reasons, but this material is disassociated from any personal identifiers and completely inaccessible to other users. Facebook also does not use content associated with accounts that have been deactivated or deleted.”