If other people gain access to your Facebook account then they can create posts, contact your friends and even change your account password, so it's important to be aware of any suspicious activity as soon as possible. As well as browsing through your recent activity you can set up a number of Facebook security features to alert you to unusual login attempts.
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Viewing your recent activity on Facebook can give some clues as to whether someone else has accessed your account, though if someone did log in but didn't make any changes then no trace is left in your recent activity list. To find it, open your Timeline page on Facebook and click the "Activity log" button -- recent likes, comments and posts you've made on the social network are displayed on screen, with the newest ones listed first. If you see activity you don't remember, you can delete it using the drop-down menu to the right. It's also worth checking the "Messages" screen (accessible from the news feed) to see messages recently sent and received by your account.
Facebook provides a list of active sessions showing the devices and locations that you've accessed the site from recently. Click the gear icon on the toolbar, choose "Account Settings" and then open the Security page. Click the "Edit" link next to the Active Sessions heading to see details of recent logins -- if you see an entry that you don't recognise, click the "End activity" link to log out from that device remotely. Remember that times when you've logged on from mobile devices and other computers will be listed here. If someone else logged into your account and has since logged out, the activity may not be included in the list of active sessions.
From the Security page under Facebook's Account Settings you can configure login notifications by clicking "Edit" next to the relevant entry. Once activated, login notifications send you an alert -- by email, text message or both -- whenever your account is accessed from an unusual location or device (typically one you haven't used in the past). If you want to receive text message updates, you'll need to have a mobile phone number associated with your account. The login notifications include instructions for resetting your password and protecting your account if you come across an unauthorised login attempt.
You can also make use of a Web browser's history to see if anyone else has been using your Facebook account without your permission (on a computer shared by a family for example). In most modern browsers you can access the list of recently visited sites by pressing "Ctrl+H" on the keyboard. An entry referring to Facebook doesn't necessarily mean that your account was used to access it, but you can click the relevant item to see if the page loads using your account credentials. It's a useful alternative to have, though it is limited to checking computers you have access to.
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