or... the influence of social media sites has been underestimated. Given how much time people spend on facebook, and how often they see ads/stories, and given

or... the influence of social media sites has been underestimated. Given how much time people spend on facebook, and how often they see ads/stories, and given the attraction to an echo chamber of ideas that most people have, this just doesn't seem all that far-fetched. We don't seem to question the memeification of things, or 'viral videos' of a dancing dog that gets 50M views in a week - why does this scenario seem all that much more unbelievable?