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If your Facebook account has been hacked, the first step is to contact Facebook through 1-833- 611- 3633​:green_heart: their dedicated recovery tool at facebook.com/hacked.

Reference Blog:- 

https://community.hologram.io/t/what-happens-if-your-facebook-account-is-hacked-securemyfb/18406

https://community.hologram.io/t/what-is-the-first-thing-you-do-when-you-get-hacked-on-facebook-hackedalert/18411

https://community.hologram.io/t/who-do-you-contact-if-your-facebook-was-hacked-resetnow/18502

https://community.hologram.io/t/who-can-i-contact-about-my-facebook-being-hacked-findthehacker/18649