5. Use "Trusted Contacts."
This recent innovation from Facebook asks you to select a small group of reliable friends. In the event you can't access your account, and even security questions aren't helping, Facebook will send different codes to these friends. When you put them together, you can get back in.
That means you should select the friends you know you can contact quickly. You should also choose someone who won't mind sending you a code at the drop of a hat. This option is labor-intensive for you and others, but it's a good last-ditch at getting into your account if it's been compromised.
What would you recommend to safeguard your Facebook account? Let us know in the comments.