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You can turn off interest based ads. If this is repetitious, sorry!
The question for the publishers is are you seeing an increase in EPC to offset the drop in CPC?
ken_b: there is no way of knowing if the drop in CTR is at all related to Interest Based Ads.
Someone earlier said that they are seeing their social network site's CTR popup
Interest based advertising means that the fact that someone visited a site aimed at a high value niche can be used to show them the high cost ads on other sites.
interest-based should replace public service ads
Does this mean that my sites won't show ads relevant to my content anymore?
No, that's not the case -- interest-based ads won't replace the previous ad targeting options you're used to. Interest-based ads will compete in the same ad auction as contextually- and placement-targeted ads, and we'll continue to show only the ad(s) that will generate highest earnings for you. ...
I ordered some tea over a month ago and I'm still seeing ads for that company on my site. Why would Google think an ad for a site I already order from would be something I would click?
Can I opt out of interest-based advertising for my site?
.. However, you cannot opt out of showing ads to users based on their previous interactions with the advertiser, such as visits to an advertiser's website...