Live.com

I'm having a problem with my live.com account. It seems that someone else is using it to access Facebook. The only messages in the account are from Facebook and if you click on the link it will take you to their Facebook page. We changed the password but we are not sure of what to do about the access to the account. I really don't think this was intentional just some sort of screw up. The Facebook page looks like a normal teenagers page and the email listed on the Facebook account is different from this one. Any ideas???