Google has realized that on websites (especially on blogs) there is some information which is not suitable for ad display decision making. Such information mostly lies in the sidebars and footers. Sometimes, Google’s ad serving algorithm gets confused and take this irrelevant information in account while deciding which ad to show.
Section targeting is a mechanism to ensure that the algorithm gets the right content to decide about ad serving. The mechanism is very simple. You just need to put markers in your blog’s code to tell the algorithm about the content that should be considered.
Marking content that should be considered
For this, Google has provided the following HTML tags. These tags are read by the Google ad serving algorithm:
<!-- google_ad_section_start --> <!-- google_ad_section_end -->
THIS POST BELONGS TO OUR GOOGLE ADSENSE BIBLE (a must read for AdSense Success aspirants)
You should enclose the content you want to mark within these start and end tags. You can do so by placing these markers in your single post code. For example, in case of WordPress, you may consider enclosing the_content() function within these tags:
<!-- google_ad_section_start --> <div class="entry-content"> <?php the_content(); ?></div> <!-- google_ad_section_end -->
Marking sections to be ignored
If you want certain portions of your web page to be totally ignored by the ad serving algorithm; you can add weight=ignore to the start tag. For example, if you want comments on your page should be ignore –then WordPress code could look like this:
<!-- google_ad_section_start --> <?php comments_template( '', true ); ?> <!-- google_ad_section_end -->
Is it worth to do section targeting?
Yes, it appears to be a good idea to implement section targeting. It helps ad serving algorithm to select the best ads to be shown on your webpage. This would help increase your AdSense CPC and CPM rates.