Commentary on blogs usually comes in two forms: comments there and posts on other blogs. In my experience, comments tend to disagree and to be negative or insulting much more than links from other blogs are. In a rough count of comments and posts taking a definite position on this blog, 25 of 35 comments disagreed, while 1 of 12 posts did, even if you don’t count another 11 posts which link without comment, a seemingly approving act. Why is this?
Here’s a theory. Lets say you want status. You can get status by affiliating with the right others. You can also get status within an existing relationship by demonstrating yourself to be better than others in it. When you have a choice of who to affiliate with, you will do better not to affiliate at all with most of the people you could demonstrate your superiority to in a direct engagement, so you mostly try to affiliate with higher status people and ignore or mock from a distance those below you. However when it is already given that you affiliate with someone, you can gain status by seeming better than they.
These things are supported if there is more status conflict in less voluntary relationships than in voluntary ones, which seems correct. Compare less voluntary relationships in workplaces, schoolgrounds, families, and between people and employees of organizations they must deal with (such as welfare offices) with more voluntary relationships such as friendships, romantic relationships, voluntary trade, and acquaintanceships.
This theory would explain the pattern of blog commentary. Other bloggers are choosing whether to affiliate with your blog, visibly to outside readers. As in the rest of life, the blogger would prefer to be seen as up with good bloggers and winning stories than to be bickering with bad bloggers, who are easy to come by. So bloggers mostly link to good blogs or posts and don’t comment on bad ones.
Commenters are visible only to others in that particular comments section. Nobody else there will be impressed or interested to observe that you read this blogger or story, as they all are. So the choice of whether to affiliate doesn’t matter, and all the fun is in showing superiority within that realm. Pointing out that the blogger is wrong shows you are smarter than they, while agreeing says nothing. So commenters tend to criticize where they can and not bother commenting on posts they agree with.
Note that this wouldn’t mean opinions are shaped by status desire, but that there are selection effects so that bloggers don’t publicize their criticisms and commenters don’t publicize what they like.