I have a site (a forum) with the topic of widgets. I implemented AdSense on the site so I got ads about widgets - which is fine so far.
Because the forum-software is not very search-engine friendly, I added the canonical tag yesterday. It was the only thing I changed in the last weeks.
And now - what happens? I get only ads from SEOs - no more ads about widgets!
I thought about posting this in the AdSense-Forum (and if a admin thinks so as well, please move it)... But isn't it a hint that Google somehow thinks all sites with a canonical tag are SEO-related? But why are they giving ads for SEO to someone they think is a SEO? It's very strange.
[edited by: tedster at 4:22 pm (utc) on Apr 29, 2010] [edit reason] "widgetize" the keywords [/edit]
Don't worry about it too much - it is showing SEO ads TO YOU because you've been to SEO-related sites (such as this one) and some ran AdSense. They got your cookie/IP and now know that you are interested in SEO - "interest targeting" I think is the term. Your actual visitors are seeing ads about other stuff that interests them - no less irrelevant to your site - if those ads promise to have a higher CPM than the ads related to the theme of your site.