There’s also a chance that hackers have broken into your account as well. If so, you can log them out of the account remotely using your own device.As luck would have it, it’s very easy to log out of any or all active Facebook sessions from whatever device you happen to have at your disposal by following the instructions below…. 

Close active Facebook sessions using a computer:

1 – Log in to your Facebook account and click the “arrow” shaped settings icon located in the upper right-hand corner of the screen.

2 – Click Settings.

3 – Click the Security and Login link on the left side of the screen.

4 – Scroll down to the section labeled “Where You’re Logged In” and you’ll see a list of devices that are currently logged into your Facebook account.

You should see the device you’re using right now listed. Any other devices that are listed are also logged in to your account. Log those devices out remotely by clicking the three vertical dots over on the right and then clicking Log Out.

Close active Facebook sessions using a mobile device:

1 – Log in to your Facebook account and tap the Menu button (depending on your version of the app it either looks like 3 horizontal lines or three vertical dots).

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2 – Scroll down and tap the Settings & Privacy link.

3 – Tap the Account Settings link.

4 – Tap Security and login.

5 – The “Where you’re logged in” section will list all the devices that are currently logged into your Facebook account.

Tap on every device that shouldn’t be logged into your account (that would typically be every device that you aren’t using right now) and then tap Log Out.

That’s all there is to it. Now the only device that should be logged into your Facebook account is the one you’re using right this minute.