Since many people use their Facebook account to log in to other sites, keeping it secure is very important.
Click on "Settings," then "Security" and then "Where you're logged in." On that page, if you see any unfamiliar login locations, you might have been hacked.
Thankfully, Facebook lets you "End activity" for that specific login location, but for peace of mind, you can click "End all activity" for the account.
Users should also look at their messages to see if there are any out of place or unusual messages they didn't write. Unusual friend requests are also a sign of hacking.
The most important you can do is change your password and set up two-factor authentication. Doing so ensures your account is harder to hack in the future.
To learn more, check out the video below from CNET: