See Who's Snooping In Your Account-Facebook

Need to know whether somebody is signed into your Facebook account without your consent? In the first place, go to your Settings page. Under the Security and Login organizer, you'll see "Where You're Logged In." Here you will discover all your dynamic Facebook log-ins from work area or cell phones. It will (generally) give information on the area, program, and gadget. In the case of something appears to be fishy, you can log out from singular gadgets (tap the menu > Log Out) or all gadgets on the double (look down and click "Log out All Sessions.") This proves to be useful on the off chance that you sign in to a companion's PC or on some open PC, yet neglect to log out.