Yahoo is already transferring its PPC traffic to Microsoft AdCenter, so it's worth mentioning that Yahoo's traffic includes, by default, its search partners. To avoid running on Yahoo's search partners - on each ad-group-level settings page choose the following ad distribution: Search network – Only Bing and Yahoo websites The default option there is “All Bing and Yahoo search networks and syndicated search partnersâ€. It includes Yahoo’s search partners, which on my experience are mostly poor-performing. Under Yahoo’s UI the search partners had lower CPC/CTR and much lower conversion rates. It might be that Microsoft is filtering this traffic section better than Yahoo did – but don’t count on it for now. I would run it separately and judge the results after some time. (Similar logic is used when you separate Content from Search)