While reading about the Adsense Site authorization feature earlier today, I stumbled on an article which I believe will be helpful to those that have been wondering why their Adsense reports include sites they don't manage.
The article lists reasons why Adsense systems might attribute a few impressions to sites that you do not control and sites where you've not directly placed your ad code. According to the article, these can include:
==> Sites that serve the contents of your site from their own domain. You can authorize some of these sites that you trust to display ads.
==> Improper iframed redirects. For example, some sites create an iframe through which they reference another site.
==> Web pages forwarded in email clients.
==> Duplicating (in other words, copy and pasting) of stories from one publisher to another.
So, when next you see impression from some strange sites in your Adsense report, stay calm...lol :)
Do you experience such?