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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.
Where you should be: Account settings > Notifications tab.
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From here, you can change how and when you are notified about things happening on Facebook, when you are using the site or when you are not. These include notifications from groups, applications and other Facebook features.
1. Scroll down and select Edit. From here, you can see a selection of check boxes to determine whether an email should be sent or not reminding you of that notification.
Simply go through and select when you want to be notified by email or not. If you have a mobile phone set up, you may also have a text message notification column enabled.
2. To change email settings for groups that you are part of, select Change email settings for individual groups.
If you are a member of a group, you can limit whether you receive email updates from the group or not.
3. To enable email updates, check the box, otherwise ensure the box unchecked to opt-out of email updates.