If you forget to log out of Facebook at the office or elsewhere, you can do so remotely. From "Account" choose "Account Settings," then "Account Security." Here, you can choose to get notified via SMS or e-mail if a new computer or mobile device logs into your account.
Another good feature: You can also view the latest activity: the time, location and device that accessed your account. If these locations are suspicious, you can choose "end activity" to log out of the location.