Where to Report Adsense Invalid clicks

Here is the link :
https://www.google.com/support/adsense/bin/request.py?contact=invalid_clicks_contact

If you suspect that invalid clicks are the result of a visitor to your site, recommend you check your site logs for any suspicious activity and notify us of your findings. This information can help us to solve any problems, although, as stated in adsense Terms and Conditions,

Google will use its sole discretion when determining instances of invalid clicks. If you need help in monitoring the traffic on your site, we recommend trying these Google search terms:

https://www.google.com/support/adsense/bin/request.py?contact=invalid_clicks_contact

Webmaster Resources
Website tracking and logging
Site traffic analysis

You can also use our tips and guidelines for keeping your account in good condition.

Finally, please note that they (google) carefully monitor the situation and that your account is paid for all clicks and impressions they consider to be valid.

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