your facebook account from being hacked by hackers First of all their are some points which you need to fix in your mind while using facebook :)

-Never download un trusted file may some fake friends gave you a link and ask you to download it.
-Use your mind if it is software then ask him/her for its official site so that you can download secure file.
-Never enter you USERNAME and PASSWORD in any website which seems to be not original and saying that "get more likes and subscribers"