That sounds really quite interesting, as a project sort of thing.
But to be honest, no. I don't think I want to chat with people simply on the basis of viewing the same webpage. I go to websites to enjoy the content of those sites and then I'll take that content and discuss it with friends or other open forums. Giving random "pubbies" on the internet a direct channel to scream at me on every site I visit just does not seem like a fun way to live.