Thanks for your emails letting us know about the recent activity on your site. I've noted your input and we'll continue to monitor the situation. I'd also like you to know that due to the proprietary nature of our algorithm, we're unable to disclose any details about the activity on your account.
If, in the future, you're concerned about the activity on your site, feel free to review your site's traffic logs for suspicious activity and notify us of your findings at
https://www.google.com/support...contact=invalid_clicks_contact 
. This information can help us in resolving any issues, although as we've noted in our Terms and Conditions, Google will use its sole discretion when determining instances of invalid clicks. If you need help logging the traffic on your site, please try these Google search terms:
Webmaster resources
Website tracking and logging
Site traffic analysis
You can also find tips and guidelines for keeping your account in good standing by visiting our Help Center at
https://www.google.com/support...nse/bin/answer.py?answer=23921 
.
I understand that you may have questions about what Google is doing to prevent invalid click activity. Rest assured that our specialists carefully monitor clicks and impressions on Google ads in order to protect your interests as well as those of our advertisers. To do this, we use both automated systems and human reviews, analyzing all ad clicks for any invalid click activity that may artificially drive up an advertiser's costs or a publisher's earnings.
Lastly, I wanted to let you know that in the future, we may adjust your payment for any days during which invalid clicks occurred. This helps us protect the integrity of the AdSense program and properly credit advertisers for any invalid activity.
We appreciate your cooperation and look forward to your continued participation in AdSense.
For additional questions, I'd encourage you to visit the AdSense Help Center (
http://www.google.com/adsense_help 
), our complete resource center for all AdSense topics. Alternatively, feel free to post your question on the forum just for AdSense publishers: the AdSense Help Group (
http://groups.google.com/group/adsense-help 
).
Sincerely,
Kento
The Google AdSense Team
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