Having your ads next to porn, is very different than having your ads inside a technology that may show porn. For example, advertisers do not want their ads sho

Having your ads next to porn, is very different than having your ads inside a technology that may show porn. For example, advertisers do not want their ads shown before a youtube clip if it contains porn. Google is not seen as a 'porn brand' because ostensibly they are just technology - they help you find stuff. Tumblr had a problem in that a considerable portion of their content was porn. If it happens that Google develops this popular attribution, i.e. they are known as a 'porn brand' - then people would advertise there, but I don't think this will ever be the case. FYI - Google also has some content controls, they don't have ads for porn, they don't promote it etc. Again, this is very easy social math. The 'proof' is not in any of my statements, rather, it's the consistent application by basically every ad agency: they don't want their ads with porn. But they're ok with their ads on a site that may happen to show it if there isn't a branding concern and there obviously is not with Google.