Page is a not externally linkable
-- Google AdSense
---- Cause of invalid clicks?
Pirate - 4:42 pm on Mar 30, 2005 (gmt 0)Thread source:: http://www.webmasterworld.com/google_adsense/5876.htm
Could be charity ads for a small part of your traffic. Maybe there isn't ad inventory for a specific niche (channel) on your site for a specific traffic origin.
Brought to you by WebmasterWorld: http://www.webmasterworld.com