I don't think conversation on the web has been the big benefit some people think. Do you remember when you first realized that people weren't talking to you in a response to your post, they were talking over your shoulder to the people who read your post. I guess it depends on who you are, but I don't see any value in providing a surface for spam. These days I block people without much thought if I think that's what they're doing. So, why should you design a protocol, and pay the cost of supporting, something that is a vector for spam and abuse? That's the argument in favor of using RSS to glue things together. You can comment on my post, in your space, but my followers don't have to see it. That's up to me. I think it would change the nature of discourse, for the better. #