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Using a 'two-factor' system, Facebook can send you a text message or an email when you are logging in from a location or computer it does not recognise. This is wise, as it allows you to verify that nobody else is trying to access your account.
1. Recommended setting is text message, if you want to enable this feature.
Recognised devices are laptops and smartphones from which you have logged in from. You can select the name when you log in for the first time on that device.
1. If you see a device you have not named, or do not recognise, hit Remove and it will log you out from that device.
If you have left Facebook on in another location, such as at work or on a friend's house, you can terminate that session remotely to prevent anyone accessing your account without your permission.
1. If you see a last accessed time that you do not recognise -- because of the time, the location or the operating system and browser used -- hit End activity.
Remember: if you do ever spot anything which you see as suspicious, change your password immediately.