Gal of 60in3.com sent in a tip about Google AdSense:
I use Google AdSense on this site but I kept on seeing issues with some ad units showing up as blank. Turns out Google tries to fill in the ad units from top to bottom. If they don’t have content for ANY of the ad units, they stop. That means that if just one of your ad units doesn’t have content from Google, none of your later units will either, even if they’re simple text ads.
In my case, I have an image ad block at the top. Since image ads are rarer than text ads, Google would often have a problem filling this ad block and would substitute in a PSA [public service ad]. This would cause AdSense to not try and fill in any of my other ad blocks even though they were simple text and link ads for which Google has plenty of content.
Lesson learned, don’t put ad blocks with images at the top or don’t use them at all. Including the text Google sent me here:
Hello Gal,
Because you’ve chosen to display ’image ads only’ in the first ad unit on
your page, it’s likely that you’ll see PSAs. Image ads are still new to
advertisers as well as to publishers, so the available inventory of image
ads for your content may be low. Please note that the first ad unit on the
page is the first to be ’filled’ with ads, so if no ads are available for
the first ad unit, your other units will not display ads.
I understand that you may sometimes see ads appear in the first ad unit
after refreshing the page. At this time, AdSense uses technology that
determines a web page’s meaning and serves ads from our pool of AdWords
advertisers that are relevant to that page at that moment. In addition,
the available advertisements depend on the budget and criteria an
advertiser has selected for a specific campaign. As a result, you may not
always see ads available for your ’image ads only’ unit.
I’d recommend updating your ad code to display both text and image ads, to
take full advantage of our ad inventory. To do so, you’ll need to
regenerate your ad code from within your account.
However, if you’d still like to show only image ads in your first ad unit,
you may wish to implement an alternate ad by following the instructions at
http://www.google.com/adsense/alternateads .
[Thanks Gal J.!]
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