Yesterday a web site published a hack for Facebook that lets anyone read anyone’s profile. It was possible to read details such as location, gender, relationship status, political views, religious views, etc. It didn’t matter what privacy settings people had set, this hack made it all visible.
Today Facebook have acknowledged the problem and fixed it.
This is a good reminder that when you publish information online, you lose some control over it. If something is so private that you can’t risk others seeing it then don’t publish it.
You can read more about the exploit here.