If you know these methods then you can protect yourself from getting hacked and save your Facebook account password.
If Facebook hacker or any specific Keylogger, by some means, hacks your primary Gmail or yahoo account which you are using as primary email address, then this information account can easily hack your Facebook password using “Forgot password” trick. The Hacker will simply ask Facebook to send password to the primary email address and ask Facebook administrators to send the reset email to your primary email address- which is already hacked. Thus, your Facebook account password will be reset and it will also be hacked !
Learn how to hack Gmail password :
So, always remember to protect your primary email address that you have used to create Facebook account and try to keep unknown or useless mail id as your primary email address in Facebook.