I think the previous poster might be referring to the fact that if you click on a result in a Google SERP (search engine results page), and then hit back and cl

I think the previous poster might be referring to the fact that if you click on a result in a Google SERP (search engine results page), and then hit back and click on another result (e.g. due to the site not allowing you to view the content), in aggregate that site gets a severe ranking penalty. Given the prevalence of adblock users, a site that implements this (which is not hard at all -- just check if `<div id='ad' style='height:1px'></div>` has a height of 1 or 0) will quickly drop off Google.