Maybe they have a sample user group who are equipped with some keyboard/mouse logging type system that can report to them? They could even do it to all (or som

Maybe they have a sample user group who are equipped with some keyboard/mouse logging type system that can report to them? They could even do it to all (or some subset) of visitors via Google Analytics[1] to report the (x,y) position when click occurs. It wouldn't surprise me if an awful lot of the internal use of GA is for ad-fraud detection. I recall way back in the day some ad networks were using imagemaps[2] instead of plain links because they'd report an (x,y) postition relative to the image, and could probably filter out the really dumb clickbots that would hit the precise pixel centre of the element every time. [1] https://developers.google.com/analytics/devguides/collection/gajs/eventTrackerGuide https://developers.google.com/analytics/devguides/collection... [2] https://en.wikipedia.org/wiki/Image_map https://en.wikipedia.org/wiki/Image_map