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Would this account for a problem I have seen others reporting that their sites get less revenue since the google change to making diffent numbers of ads appear in the ad blocks. This is a completely untested theory so don't hit me over the head for it. I just always thought, and google says it, that the most relevant ads are at the top. Hard to see how the first ad block could be a psa, and the most relevant, while the other ad blocks are populated.
1) The order in which the requests are made
2) Web routing from your visitor's browser to the AdSense Server
3) Maybe some internal stuff going on at AdSense to try to correllate requests, timestamp them down to the millisecond, and try to serve the highest paying ads in the first request received, making the assumption that the browser requested the most important adblock first. (Not a perfect assumtption by any stretch of the imagination). Maybe not... maybe they just send back ads first come, first served with most important. Who knows.
4) I have definitely seen ad blocks carrying identical ads, which is against AdSense ToS, but how would I or any other publisher control such a problem? lol
Then Google would be able to correlate which adblocks on which page get better clickthrough rates (even if it isn't the publisher's #1), and send the higher-paying ads to that block, too.
Oh, wow. This is the BEST idea I've seen for an AdSense improvement since I started in January!
I hope ASA passes this idea waaaay up the ladder. :-)
This happened to me! I added a second block, and sort of assumed that because it was lower down the page it would be filled with grade 2 ads / psa's. That wasn't the case. The best payers moved to the lower block simply because I use a table on that page, and the main ad block comes lower down the html code than the lower block on the left of the page.
I then saw a post here that mentioned the "Table trick". If you Google for that then you will get the explanation for why, and what to do about it.
The 2nd and 3rd blocks may have show ads instead of the 1st block because the content surrounding those blocks may have been more relevent to the available ads.
If i was getting psa's on a page with multiple ad blocks i would get rid of one or two blocks.
Thanks for the about allowing publishers to prioritize ad blocks. I have, actually, passed this thread along to the product team. ;)
Feel free to shoot me a sticky mail if you have any other ideas and want to make sure I see them! I try to read everything, but I probably miss things...
If you're interested in doing this, see the following page for more information:
Sure, I could create 3 different channels for each page (for up to 66 pages) and track which is performing best, and in fact, I do but not on a individual pages, on a series of template-driven dynamicly generated pages.
I find that I do NOT get the highest PPC on the ads in the top position, where I get the highest CTR!
This is based on 2 different sections of a site with 45,000 and 8,000 page impressions in July.
(In August, so far that has reversed, but August has been a VERY strange month for me, starting off very nicely, then declining very sharply on the 10th...)
If G would put the highest paying ads on the proper place on the page, we'd be making more money, perhaps.
(Want to see the stats, ASA? Sticky me. (ASA only))
explanation: technical processes
as i said, i haven't encountered this phenomenon before and haven't changed site layout. also, the ads occur in the html-code strictly one after another.
of course there could happen internal stuff on the google adsense server.
my question is: is it in fact an accidental technical instance or is it intended by the adsense system (content based)?
if it is intended, that would of course negate the dogma, that highest paying ads occur on the first block on the page respectively on the block which is encountered first in html code.
surprisingly this kind of ad-switching between the blocks seems to have no negative effect on my earnings.
and it doesn't occur all the time, so my thougt: is google playing with ad placements recently?
"We've updated AdSense to now vary the number of text ads that appear in a given ad unit. When we have a set of highly relevant and useful ads, we give them more of a presence in the ad unit by eliminating other ads. In some cases, if we determine a particular ad performs extremely well on a page, we'll remove all other ads from the unit and show just this single ad."
why didn't the adsense team inform us? i think this is an important update and maybe some publishers felt confused with what has happened to their ad blocks?
My work-around is just to include collapsible ad units instead of the PSAs or alternate ads, this way (unless by some quirk of fate all 3 are PSAs), the top ads still appear at the top.