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On the sites I am running Adsense on my CTR since the beginning of September has reduced sharpely - The first few days Google seemed to be having some reporting problems but the trend has continued.
Anyone else experiencing this? - I have not made any changes to the site that would affect CTR and my Stats are now very depressing :(
CTR, EPC has remained fairly stable since the increase. No PSAs in my site, too - all ads are well targeted.
I don't think people are getting immune to text based ads. I am not seeing anything in my site to support this hypothesis.