iAdSense doesn't send your credentials or other private data to servers other than Google's. Also, communication with Google servers is always done over Secure HTTP. iAdSense does communicate with other services, like Yahoo for currency conversion rate and with a private server (owned by the programmer) for usage statistics, without sending private data.
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Don't be shy and submit all your suggestions and ideas. I'm an iAdSense user myself and welcome any improvements. Check the Contacts & Support page to know how to reach me.
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