Facebook isn't without its share of problems, but this weekend they added a helpful feature to avoid more privacy fiascos: now, you can logout of active Facebook sessions from any computer.
We've all been there before: You log into Facebook on your friend's computer (or worse, a public one) and forget to log out when you leave. Now, though, you can go to Facebook on any other computer, head to Settings > Account Settings > Account Security and end activity on any sessions that are still up and running. You should be able to distinguish which ones aren't your computer pretty easily by the location, operating system and browser (especially if you've already specified names for your regular machines). It certainly doesn't fix everything, but it's definitely good for some piece of mind.