I'm involved in a very large website which runs Google Adsense. I've noticed that on same pages, we don't succeed at getting contextual ads. I'm trying to figure out what to do about this since the non-contextual ones earn less (less dollar per click, lower click through rate). Often, I don't even get an ad served up on these pages. There are three reasons that I can think of that the "list" page is not getting enough context. 1. The URL is not SEO-friendly. (see A) All the other pages on the site have SEO friendly URLS but on this huge site, 50 million monthly page views and over a million pages of word lists, we decided to not implement a look up table for SEO friendly URLs (it slows and complicates the site to have seo-friendly urls). 2. The text on the page, especially near the top, does not give much context. In fact, looking at the code, I see: We're using some sort of standard text for the meta keyword and description. It's probably the same across all one million list pages. It's really long too. The title tag seems to be picking up proper context by providing the grade level, school name, teacher name, city, and state. 3. The page is "do follow, don't index." The result (see B & C on the grpahic) are ads that are not optimized for the context or not served up at all (The top ad is a sponsorship, not a google ad) Any useful thoughts?
I don't think so. Does anyone know what the balance Google uses for figuring out the the context for the ads? What percent of the input is from the site overall or from the specific page?
It also has to do with the viewer's history. Make sure you are not logged in to any Google products when viewing the site. Better yet, view the site from another computer to confirm. Are you using a content management system? Make sure you are not logged in there either.