How to unregister a Facebook account
While Facebook can be a lot of fun, it is also vacuums up your free time. Fortunately, Facebook gives you the option of unregistering, or deactivating, your account. When you deactivate your account, your profile is gone from Facebook, and you will not appear in search results.
However, your friends can still invite you to events and send group requests to you. You can opt out of receiving e-mails to keep from getting these requests.
Open Facebook. If you are not logged into your Facebook account, enter your e-mail address and password to log in.
Select "Account," then "Account Settings" to open your Account Settings page.
Click the "Deactivate" button to open the Deactivation page.
Select a "Reason for Leaving." You can enter a more specific reason in the "Please Explain Further" field.
Mark "Email Opt Out" to stop receiving e-mails from Facebook.
Click the "Confirm" button to complete the process.