Worth noting this is Appnexus, not Google AdExchange. Appnexus is still a very large ad exchange, but Breitbart's business shouldn't necessarily be affected. It

Worth noting this is Appnexus, not Google AdExchange. Appnexus is still a very large ad exchange, but Breitbart's business shouldn't necessarily be affected. Its not unlikely that Appnexus and Breitbart don't even have a direct relationship, and Appnexus is just going to block bids on that domain.