How you can Unblock Domain / Website From facebook I am going to share trick here is some tips you can follow and unblock your website 
Go to : [https://developers.facebook.com/too...developers.facebook.com/tools/debug/?ref=u2u)
Put your website URL and click Debug
You will face an error and see an option Lets us know
Click lets us know a page will appear facebook block
Put this message and done after 48 hours domain will be unblock
its message
"Good Morning Facebook! With due respect, I would like to inform you my website URL has been blocked on Facebook. Recently I got to know my website URL: "Put your Website" has blocked on Facebook and prohibited me to share my website links over my pages and my timeline. I didn't go against your policies. I apologize If I have broken any Facebook policy by any mistake. It is requested please unblock my website URL and enable its links. I thank Facebook Team for making it a safe place for all.! Please Unblock my website. URL: "Put your website" Thanks in Advanced. "Your Signature"
Go to : [https://developers.facebook.com/too...developers.facebook.com/tools/debug/?ref=u2u)
Put your website URL and click Debug
You will face an error and see an option Lets us know
Click lets us know a page will appear facebook block
Put this message and done after 48 hours domain will be unblock
its message
"Good Morning Facebook! With due respect, I would like to inform you my website URL has been blocked on Facebook. Recently I got to know my website URL: "Put your Website" has blocked on Facebook and prohibited me to share my website links over my pages and my timeline. I didn't go against your policies. I apologize If I have broken any Facebook policy by any mistake. It is requested please unblock my website URL and enable its links. I thank Facebook Team for making it a safe place for all.! Please Unblock my website. URL: "Put your website" Thanks in Advanced. "Your Signature"