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This is for a directory site that covers pretty much everything, so a few advertisers making changes should have no effect.
Here's what I found out...
Before Jan 19th... the ads are generally targeted on my site theme. Now, it's targeted to the content of each page. Sounds like the latter targetiing would result in higher CTR, but in my case, a lower CTR is the result.
My other revenue source: price comparison co-brand... the merchant seems to be bidding up again.
So my guess is that CPC will begin to raise as soon as next week. Though I maybe wrong.
If this is a seasonal variation, it wouldn't make sense that it would change overnite like this.
Also, please stop trying to make a trend out of fractional days. If you have to use a decimal point to describe how many days there has been a trend, there is no trend. A 0.5 or 1.5 day trend?
Finally, most posts have not given their topic areas, so you can't deduce anything from the above 'me too' answers.
I've checked the SERPs but my ads are so diversified across so many sites and categories that I can't find any cause for the change. Also, it's noteworthy that total page impressions have only dropped by about 5-10%.
If this was a seasonal effect, why would it take place so suddenly (everything changed on one day)? That's why my best guess is that Adsense has changed. Either the algorithm they use to serve ads or maybe the way they track the clicks. Who knows....
Maybe I'm not seeing the picture here, or maybe you guys have amazing CTR. But my average CTR is only 10-30% - so unless you're getting higher then 40-50% CTR, how can you have a 40% CTR drop?
If you do manage to have above 40% CTR; what am I doing wrong I wonder?
January will be a lower month for all of us. While I'm still making more then I did in December, my earnings rise about 20% every month, as well as my traffic.
But when you think about it, most people won't be buying much on the 'net in Jan. because everyone spent their money in December. For a lot of people, you will experience lower CTR because of buyer trends, which affect everyone, as well as webmasters.
At least that's what I imagine is happening. Correct me if I'm wrong
Maybe I'm not seeing the picture here,
You're not, 40% of anything is a little less than half, right? So even if the OP was used to getting a 1% CTR, a 40% drop would leave him with .60% CTR.
Edited to say: Posted at the same time as previous answer.
[edited by: flobaby at 7:52 pm (utc) on Jan. 21, 2005]