Facebook announced some new tools and systems designed to keep you abreast of suspicious activity:
- Login Notifications: we've been testing a new feature that allows you to approve devices you commonly use to log in and then to be notified whenever your account is accessed from a device you haven't approved. To try it out, go to Account Settings page, click the link next to "Account Security" at bottom of the page. If selected the option to receive notifications for logins from new devices, when you log in, you'll be asked to name & save various devices you use to access Facebook.
- Blocking Suspicious Logins: Also, built a system to ‘block suspicious logins’ before they happen. When someone try to access your account from an unusual device, Facebook ask an additional verification question to prove his or her identity. Once you've confirmed your identity, you'll have opportunity to review recent logins on your account and reset your password if you see logins that you don't recognize.