> Recently, a lot of advertisers (e.g. Proctor & Gamble) quit spending ad dollars on 2nd and 3rd-tier ad exchanges because their A/B measurements showed they we

> Recently, a lot of advertisers (e.g. Proctor & Gamble) quit spending ad dollars on 2nd and 3rd-tier ad exchanges because their A/B measurements showed they were a waste of money. Can you share a link? I work in digital marketing and would be super interested in more info on this.