Yes, the hash is &quot;facebookcorewwwi&quot;, this is the hash of the public key of one of the keypairs facebook generated. We can&#x27;t pretend to be facebook without knowledge of the corresponding private key, however.<p>To make this more clear, most tor hidden service sites that don&#x27;t have loads of computing power to bruteforce a vanity domain have uris that look like <a href="http:&#x2F;&#x2F;3g2upl4pq6kufc4m.onion" rel="nofollow">http:&#x2F;&#x2F;3g2upl4pq6kufc4m.onion</a>