Visit Facebook account that you desire to unsubscribe.
Click account (above on the right) and select account settings.
Delete Completely Facebook Account
Click on 'Security' in the column left wing. At the bottom of the right pane, click on the link "Disables your account"
In the window that opens, examine one of the boxes to show the reason that you wish to deactivate your account. If let uncontrolled the box on the side of not getting email, will continue to get invites to events by your pals, requests to join groups, and so on. Then click the button to verify,
In the window that opens, enter your password and click the "Deactivate Now".
And you all set you a message telling you that your account has actually been shut off. If sooner or later wish to reactivate it just please, log in using your e-mail address and old password.
Well I hope this Tutorial will help them to unsubscribe or Delete Completely Facebook Account.