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This should be very helpfull on pages that cover several topics, like a home page might.
Haven't tried this yet because I just spotted the notice while checking my stats. Sounds interesting though.
[edit note] edited to remove a quote[/edit]
<!-- google_ad_section_start_adsenseblock1 -->
<!-- google_ad_section_end_adsenseblock1 -->
If I select a quite small part of the page with the most quality content and the most specific keyword, will I get less ads, or will Google also take a look at the other content?
From the page linked to above, Google says the section should include a large amount of content for the best results or you might get PSA's if there isn't enough content to analyze.
The idea is interesting but in my opinion is incomplete.
Or best of all -- maybe I can quit having to do some keyword tweaking to convince AdSense what the real topic is. Like, I could write about traveling to Mars and Venus, and include a little comment to AdSense that says "yeah, I know I only used the phrase 'outer space' twice, but it's rather strongly related to the topic of this article".
I hope this means that Google is now confident enough that their other mechanisms can weed out most AdSense spammers, so they can let real content providers give some hints to guide AdSense. Heh, in fact, I kinda hope using this new mechanism attracts increased attention from the Spam Squad. I mean, you can kinda guarantee all AdSense spammers are going to try this as soon as they hear about it, right?
At last, some hope that the content creator can help get AdSense back on topic when it gets confused. I'm going to try it right now -- sure hope it works!
In any case webnmasters are the ones that get the most out of this competition
Assuming the earnings stay as high as they are now, seems to be going up.
If the earnings plunge I won't care about the new toys.
I asked for this a month ago! An adsense hint tool
AdSense has had hints for a long time, just not for the average joe publisher.
Well, this solves the age old problem of adjusting your HTML to make sure the content is closest to the top of the page to generate good ads.
Quite apart from Yahoo!, MSN, and other search engines, with regard to Google, it's still a good idea using CSS to put content first and boilerplate last. Why? This new <!-- google_ad_section_start --> hint is for ad selection. There is no indication that it applies to SEO.
Furthermore, as Jenstar says, the hint serves to "emphasize or downplay." It does not, by itself, guarantee spot-on ad selection. Presumably, other on-page factors will still come into play, including meta-tags, keyword density, h1 & h2 tags, and--yes--proximity to the top of the HTML code.
This google_ad_section hint may just be one more addition to our arsenal, in no way by itself a "magic bullet". If Adsense were to base everything on this one simple hint, it would be too easy for spammers and black hats to exploit, no?
Whether this is a good thing I do not know. I will have to see if the ads based on the content of the site are as good an earner.
It is great to have a little more control rather than trying to hide things with scripts