How to Check Whether Your Facebook Account is Compromised or Not

1. Sign on to your Facebook account.
2. Click the “Account” link located in the upper right corner.
3. In the drop-down menu, select  “Account Settings”.
4. Click on "Security "in left hand menu, below general account settings.
5. Go to last optios in "Accounts Settings" which is "Active Sessions".
6. Here you will find all the active session currently on as well as past history.
7. In case you see a location  or device from which your Facebook account has been accessed. 
8. Happy hunting.