Over time, you might log on Facebook using many different devices – and forget to sign out. This can grow to a pretty long list of office computers, your friends' tablets, smartphones or other devices.
In the “Security and Login” section of Facebook's settings, you'll find a list of the device, location, date and time of each Facebook login.
mouse click – for example, if your account is accessed from a suspicious location. At the bottom of the list, you'll find a button that ends all active sessions. – dpa