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the CTR on all of the sites I use Adsense on dropped suddenly by about 1%-2%
My sites are pretty consistent however 1-2% is even within my spread of usually up to 5-6% normally, 10% at a stretch and anything over that I start to question and come here to ask.
Keep up with Google as they just changed their UI on the SERPs which is messing with traffic and just rolled out Caffeine with officially sucks as it messes with long tails.
More space given to other advertisers may be the best answer.
and I've made no significant changes of any kind.
For the first time since Adsense launch in 2003 I've begun dropping Adsense from certain pages and replacing with alternate advertising
We went the opposite route and dropped the other ad networks and gave some of our premium spots back to Adsense exclusively. We had been using several ad networks and rotating them on some of our premium spots.
netmeg, what about FaceBook? Are you advertising on there or do you get a lot of traffic from your business FaceBook page?