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Finally, we have a click fraud rate from Google itself: less than 0.02 percent of all clicks slip past its filters and are caught after advertisers request reviews. That low figure is sure to bring out the critics who will disagree. Below, more about how Google comes up with the figure plus some click fraud fighting initiatives it plans to implement later this year. The clicks are categorize differently – invalid clicks, fraudulent clicks, overall click fraud rate, detected click fraud rate and undetected click fraud rate. Google could have an extremely high overall click fraud rate, yet that's not a problem if most of those clicks are detected and either never charged for or refunds issued promptly. As for the undetected click fraud rate -- that's impossible to know. There are clicks that might get past Google and advertisers both. Potentially, this could be a high percentage.