This is great news for advertisers. Yahoo, like Google, has a search network consisting of many different sites. Most of the partner sites perform well for most advertisers. However, there are some bad apples in the bunch, and up until now, it’s been difficult if not impossible to block such sites from showing your ads. With domain blocking, the power is in the advertisers’ hands to block domains that don’t perform for them.
This is a long-awaited feature that advertisers have been requesting for a long time. I’m glad it’s finally about to become a reality.