Been following this for a bit but this is a great post by Shuman Ghosemajumder on his quote to the effect clock fraud in Google was less than 2%. In fact, while quoted this by Andy Beal, what he said was that the quantity of invalid clicks which were detect as a result of reactive investigations was a “negligible proportion” – and then clarified negligible as under 2%.
A subtle difference but important .. Google, Click Fraud, and Invalid Clicks | shumans.com
