It’s something you’ve likely seen on your Facebook page in recent weeks. You may have even participated.

People have been posting a list of 10 concerts -- nine they’ve actually attended and one they haven’t. The post then challenges that person’s Facebook friends to guess which concert is the lie.

But now, some security experts want you to think twice before sharing that kind of information.

They say hackers look for things like this because the first concert somebody attends is a common security answer that businesses -- like banks -- use to confirm your identity.