Facilitating discussion of arbitrary webpages, though, has been stupendously successful, in the form of social media. I think that’s the problem with the extension idea, it’s social media that doesn’t realize it’s social media, so doesn’t pay enough attention to the make-or-breaks of social media like content quality, drawing people good for content quality, spam prevention, moderation, and circles of shared interest. Getting HN-like commentary on every webpage is interesting, what you get if you just turn on WordPress comments then do nothing, isn’t.