Deleting and deactivating your account
If you want to stop using your account, you can either deactivate or delete it.
Deactivate
Deactivating your account puts your account on hold. Other users will no longer see your profile, but we do not delete any of your information. Deactivating an account is the same as you telling us not to delete any information because you might want to reactivate your account at some point in the future.
You can deactivate your account on your account settings page.
Deletion
When you delete an account, it is permanently deleted from Facebook. It typically takes about one month to delete an account, but some information may remain in backup copies and logs for up to 90 days. You should only delete your account if you are sure you never want to reactivate it.
You can delete your account here.