Visit Facebook account that you desire to unsubscribe.
Click account (above on the right) and select account settings.
Delete A Facebook Account Completely
Click 'Security' in the column on the left. At the bottom of the right pane, click on the link "Disables your account"
In the window that opens, check one of the boxes to show the reason that you desire to deactivate your account. If let unchecked the box on the side of not getting email, will continue to get invites to occasions by your friends, demands to sign up with groups, etc. Then click the button to confirm,
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 down. If someday wish to reactivate it simply please, log in utilizing your email address and old password.
Well I hope this Tutorial will help them to unsubscribe or Delete A Facebook Account Completely.