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by detaro 3892 days ago
You could use cert that is valid for both a clearnet and an onion domain to "prove" that they belong to the same entity.
1 comments

In addition to this, Facebook does Tor - load balancer - SSL terminator - servers. This way the cert protects your against untrusted load balancers.
Why does Facebook have untrusted load balancers?
Outsourced?