I have noticed Adsense placed many unrelated ads on my site lately, such as public service ads, and some blanks. Is it possible that on my template, I can specify the key words in on mysite, so it can serve the ads properly? Thanks.
Use section targeting and standard SEO techniques (keywords in title, headings, text, etc.) to fix up the targeting.
YOU will quite often see public service ads or blanks in your ad placement. A casual visitor however will most likely not. I found with the more page views a site gets per visitor, more likely Google will serve that visitor a default ad or blank space. Eric's section targeting link is one way you can better key the ads. perdrix
Since I am no expert in website design and HTML newbie, I got your point. Is it possible that I can specify this way <!-- google_ad_section_start --> bank, investment <!-- google_ad_section_end --> thru out the whole blog without displaying those words? The queston is how. I just want to ad related words. Thanks.
No, don't do that. Write paragraphs of content that uses those keywords are naturally as possible. Then surround those with the section targeting tags. Do NOT list keywords on your pages with no content, you violate the AdSense program policies by doing that. In general, you should be able to go to a page with AdSense ads, turn off the browser's JavaScript support, and see useful, readable content.
Do I have to tag it on every article I wrote? Or just tag on one and leave it along? The observation I have is: if I click on one of the other link, the ad seems to be OK. But I make modification and updates to my site, that is why I am getting a lot of hits when I preview it. Will this still cause problem because my hits by me? Thanks.
Often AdSense will display PSAs and blanks until it fully indexes your page (this can take a few hours). Your blog seems full of ads now. What page were your having difficulty with. Occasionally, stop words can be the problem.
You put the section targeting on pages that are badly-targeted. Normally the section targeting isn't needed, AdSense does a good enough job on its own of figuring out what the topic is. Viewing your own pages is fine. What's not fine is clicking on the ads on your site, or telling your friends and family to to do. That'll get you kicked out of AdSense.
You can always make alternitave ads so if a PSA or a blank is going to be disiplayed it will instead display the ad that you specify.
Somebody was right about if you have too many impression on your site, the pay per click rate is down, and the ads are most likely blank. The problem is if you need to do a lot of previewing, that cause this problem to occur.