Many have conjectured that blogs are echo chambers in which communities insulate themselves from dissenting opinion. Gilbert et. al. devised an empirical study of blog comments to see whether there was evidence for the hypothesis. (There was.)
This isn’t to take away the points raised in those threads, or other discussions which elicit strong opinions, but it does raise a question about whether the degree of agreement or strength of the signal is accurate. It is an interesting paper, which should open an interesting line of research.