Adsense targetting

What causes Adsense ads to lose targeting?

[diamondgrl]

I am wondering whether anybody has experimented to see whether changing ads on a page can cause Adsense ads to lose targeting.

Let's say you move an ad from the top of the page to the bottom of the page. Does Adsense sense that it is in different surroundings, lose the targeting it had already determined for that page and notify they Adsense bot that the page needs to be recrawled?

If so, what quantum of change triggers a recrawling of the page? Surely you wouldn't lose targeting if you changed the color of the headline, would you?

I ask this because I have a site that has a large number of pages relative to the number of visits per day. So that means that most times people come to a page, the ads are not targeted to the page, but rather targeted to the overall site theme.

So it seems like the more pages that have been visited, the more of an asset that is because more ads will be targeted. But then what happens if we change ad layout on the entire page?

[frox]

I have been doing some tests on that, wuthout a positive evidence.

As far as I have been able to tell, changing colors, format and even channel will not automatically and immediately re-trigger a spidering of the page.

I mean, I have a www.domain.com/test.php page with adsense on it.

When I visit the page the first time, I see PSAs, and after a few seconds the agent "Mediapartners-Google/2.1" spiders my page.

Ihe second time I visit the page I might see targeted ads.

Then I have been changing almost everything (colors, positions, layout, size, channel ..) and I have not seen the spider any more.

The obvious explanation is that there might be a minimum delay for re-spidering, even if you change some important parameter.

I will wait a few das and repeat the tests

[diamondgrl]

Will be very interested in your findings. The one thing it sounds like you have not tested is putting the ad in a different part of the page. Let me know if you get a chance to do that.

[frox]

I did test that, always without causing a respider.

and it would anyhow be difficoult for G to know the position on the page without respidering.