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In recent weeks I have also given much thought to the rise of ad blockers, which I suspect have been eroding my ctr over the past three years or so.
have been eroding my ctr over the past three years or so
If it were ad blockers, wouldn't your impressions be way down too, not just CTR?
I think it's a mix of ever more restricting methods that Google use to count real clicks and Adsense being on every crappy sites out there, leading to ad blindness.
I feel your pain.