I have been asked many times that the Adsense ads in my site only show PSA (Public Service Advertisement), and hence cannot earn any from Adsense. I hence decide to write a post on explaining why PSA will show. If you are getting PSA right now, try to find out the cause and then tackle them.
1) Google's crawler needs more time.
If Google has not previously crawled your site, it may take up to 48 hours or more before our crawlers gather content from that page. In the meantime, the ads you see may be public service ads or ads that are only slightly relevant. The relevance will increase over time. Note: Google's crawler indexes by URL and therefore considers http://site.com and http://www.site.com different URLs. Because Google's crawler will visit these URLs separately, you may notice ads appear differently on these pages.
2) Google's crawler can't reach your site.
If our crawler isn't able to access your page, we'll provide you with an error message on the Site Diagnostics page of your account.
3) Your page may contain sensitive content.
Google's system has certain filters in place to protect our advertisers from advertising on pages that could be construed as potentially negative, non-family safe or even offensive. Although the nature of your content may not fit into any of these categories, at times the emphasis of some sensitive subject matters on a page can flag our servers to deliver public service ads to a page.
4) Your website is using session IDs in the URL.
If your web pages use session IDs, you may not receive targeted ads on those pages. Since this session ID - and therefore the URL - changes every time a different user views a page, the URL will not be in the index and will be queued to be crawled. Once the URL is crawled, however, the session will most likely have expired. This means that pages seen by the users are never in the index. You will need to remove the session IDs in order to display targeted ads.
5) Your website is using frames.
Google AdSense crawlers are unable to match ads to your web page content when the AdSense ad code is placed in a frame separate from the primary content of your website. It is important to place the ad code in the same frame as the content of your web pages in order to serve ads targeted to your web page content.
6) Your ad unit is set to display image ads only.
Image ad inventory for your content may be limited at this time; if you've chosen not to display text ads in an ad unit, we'll show PSAs in that unit when there are no relevant image ads available. To avoid showing PSA's, we recommend updating your preferences to show both text and image ads or implementing an alternate ad.
7) Your web page may not contain enough content.
There may not be enough information on your site for our crawlers to determine the content of your pages. Therefore, we could be having difficulty identifying relevant ads to show on your pages.
8) The AdSense ad code was placed within an IFRAME.
Google's targeting technology is not optimized to serve ads within a separate IFRAME. If you placed the AdSense code in a separate IFRAME, your site may display less targeted ads or public service ads. For better results, please implement our ad code directly into the source of your web page. Once you make these changes, relevant ads may not appear immediately. Until we are able to re-crawl your site, which may take up to 48 hours or more, your page may continue to display untargeted or public service ads.
9) Your web pages are behind a login.
At this time, pages that require a login cannot be easily visited by our crawlers. Additionally, since these types of pages are not easily visited for approval and it is difficult for our AdSense specialists to verify that pages behind a log in follow Google AdSense policies, we are unable to offer support for these pages.
10) There are too many URLs added to your account filter list.
At times, if you add too many URLs to your filter list, we may no longer have other ads available to target to your content. As a result, you may begin seeing less relevant or public service ads on your web pages.
11) Your site content is primarily in an unsupported language.
If the AdSense code is placed on pages with content primarily in an unsupported language, we may show public service ads or ads in another language. As noted in our program policies, publishers may not display ads on pages with content primarily in an unsupported language, so please remove the ad code from these pages until we're able to support your language.
12) Your ad code has been modified.
If the AdSense code has been manually modified, such as to change the ad unit width or height or the publisher ID, then we may show public service ads. Please select the desired ad format on the AdSense Setup tab of your account and then paste the generated ad code, unedited, onto your pages. Keep in mind that modifications to your code are not permitted by our program policies.
13) Your page contains a refresh tag.
If the header of your page contains a refresh tag, this may also lead to your page displaying PSA's. Removing this tag can help ensure that you receive targeted ads.
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