How to Hack Facebook Account and How to Prevent

Note: The Reason behind for this post is  “how Facebook hacking works?”, so that you learn how this can be done and how to protect yourself. So beware of these and make others aware about these ways by sharing on your Facebook wall so you can protect your and your friend's facebook account.This is for educational purpose so you can protect your facebook account.
 Before Starting, want to tell you “Facebook hacking Software’s” exists but