You have probably heard about the security breach at Facebook that affects at least 50 million users and possibly as many as 90 million. That’s just part of the problem. Many sites let you log in using your Facebook account like the login screen you see here. Those sites are vulnerable too.
In the meantime, Facebook is trying to clean up the mess. It’s not clear yet how long those third-party sites will continue to allow you to log in using your Facebook login.
If you haven’t changed your Facebook password yet, do it now!