This is a portion of Paid Search Podcast episode 302 titled "Amazing Google Ads Q&A Episode". In this clip, Chris and Jason answer this question: 

Shopping has been the real game-changer for our little online store. This past weekend I launched our first dynamic retargeting campaign, where the specific product someone looked at is marketed back to them. Since we launched, I’ve been playing whack-a-mole constantly! I add websites to my exclusion list daily, hundreds of them. Now I check every site individually to ascertain legitimacy. This is a losing game, I don’t have the time to eliminate hundreds of websites every day! So, isn’t it better to just not let Google do automatic placements, make a list of websites that I know are legitimate websites, and only target those?
    
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