Today my friend asked me

“ how to delete FB acount permanenetly?”

I said “goto settings-account settings- Deactivate Account”

then she said “that only does the de-activation, becomes active when again clicked… wanna remove permanenetly”

Then I find following link to delete your Facebook account permanently

Go to this page:

http://www.facebook.com/help/contact.php?show_form=delete_account

Click “Submit” and follow the instructions.

Your account will be deactivated for two weeks, and if you don’t log in during that period, your account is permanently deleted.

This method is official and should be complete, i.e. no need to delete individual photos, comments, messages or items from your profile or anywhere else on Facebook!