His profile says he works for Manwin Canada... So it's very likely pornhub.com

(Manwin Canada also owns the Brazzers network of sites)

Yea, I don't think there are 50 sites out there that could boast those numbers.

Smokinn got it right. Stats that doesn't appear, we stream 1.2Billions videos/month (doesn't count embedded content).

What sort of infrastructure/hw/server software to you use for streaming?

Can you reveal any $ numbers; e.g. CPM, conversions to paid accounts, anything?

I am not affiliate with Manwin but found the article that was submitted here recently insightful. It partly deals with their operations:

The Geek-Kings of Smut http://nymag.com/print/?/news/features/70985/