Seeing it is very different to knowing about it, and I'm not just talking about in-depth knowledge. Nobody clicks every link, there are plenty of things I see

Seeing it is very different to knowing about it, and I'm not just talking about in-depth knowledge. Nobody clicks every link, there are plenty of things I see on the front page of sub-reddits, or HN, that I read the title and don't click. So, how many users have seen SOPA stories and thought "that doesn't interest me"? My guess is quite a lot.