If your whole domain was blocked from Facebook, and it is displaying this message " we believe the link you are trying to visit is malicious. For your safety, we have blocked it. " worry not as i will show you my simple methods i used to unblock Facebook url by contacting Facebook help center, you might be wondering why you have contacted them and filled appeal form countless times with no success, the answer is simple because:
How to unblock your website URL from Facebook https://tellkis.com/2019/10/29/how-to-unblock-your-website-from-facebook/