Digiday: Traffic for publishers, these days, is Google, Facebook and the rest. In that all-the-rest category, Yahoo is driving more traffic than originally thought. On June 2, Yahoo added a referral tag to its homepage, so now it can get credit for that traffic. As a result, Yahoo went from being the No. 16 referral source for publishers to No. 6 on June 2, after Facebook, Google Search, Twitter, Google News and Bing.