How do I filter out ads that appear on my publishers' pages?
You'll need to use host competitive ad filters. To set these up, go to the AdSense for Content Host tab under AdSense Setup > Competitive Ad Filter in your AdSense account.
Why are ads I've blocked through my AdSense account showing on my publisher's pages?
You might have only filtered out URLs for AdSense for Content, which only applies to your own ad code. To filter ads from your publishers' pages, you'll need to add those URLs to the AdSense for Content Host tab under AdSense Setup > Competitive Ad Filter in your AdSense account.
Where can I learn more about how the competitive ad filter works?
The Competitive Ad Filter topic in the AdSense help center does a good job explaining this feature.
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