A hacker hacked this account and linked his facebook account please help
:'(
He can login anytime he want with his facebook account

Hi.

Please make sure that you don't re-use passwords, this is the main issue of people getting their account breached.
You will have to use the Contact Form in order to recover your account. Only an admin can unlink the Facebook authentication from your account.

Don't create spam threads like this. Thank you and good luck!