Check The Facebook Account Activity, Including Information Last Login
Add extra protection to your Facebook account by activating a text message or e-mail notification if a new computer or mobile device, log into your account.
You can also view the most recent transactions in your account to see what setting you have access to your Facebook profile.
To verify this, go to Account Settings and the Settings tab you can see all the data loging. If
find the host device or location, click the end activity to stop this activity.