https://facebookcorewwwi.onion/

Proof: https://blog.torproject.org/facebook-hidden-services-and-https-certs https://www.facebook.com/notes/protect-the-graph/making-connections-to-facebook-more-secure/1526085754298237 https://facebookcorewwwi.onion/notes/protect-the-graph/making-connections-to-facebook-more-secure/1526085754298237