AdSense and AdWords under the hood

This is a message I have received today from Google:


Thank you for your email.We understand that you wish to receive specific information regarding the invalid clicks we observed on your account. However, due to the proprietary nature of our algorithm, we cannot disclose any details about how our monitoring technology works or what specifics we found on your account.If, in the future, you suspect that invalid clicks may have resulted from a visitor to your site, we suggest that you review your site’s logs for any suspicious activity and notify us with your findings. This information can help us in resolving any issues, although as outlined in our Terms and Conditions (, Google will use its sole discretion when determining instances of invalid clicks.Sincerely,The Google AdSense Team


Today we’ll disclose some of the AdSense and AdWords algorithm facts. The best way to describe such a complex system is by using graphs. No more words, there you go:


Full Diagram Adsense Adwords [PDF 2.08 MB]