I would search on moz (Seomoz) and see what you can find. However, I doubt there is much info currently public on RTB. I think your best bet is to contact Criteo or someone in that space and ask this same question or at least ask them to share what they can. You can approach it and let them know your a journalist or something similar (not trying to encroach on their space). When you can’t find content, you can find people.