This is wonky as hell, but I think it says that left-leaning blogs are more, um, democratic. They are much more collaborative for instance, where right-leaning blogs are more sole authors. The study looked at the top 155 political blogs. (I think the link is a summary of a longer (and no doubt wonkier) paper on the way the left and the right blogsphere differ in terms of their use of the available technology.)
Sites on the left adopt more participatory technical platforms; are comprised of significantly fewer sole-authored sites; include user blogs; maintain more fluid boundaries between secondary and primary content; include longer narrative and discussion posts; and (among the top half of the blogs in our sample) more often use blogs as platforms for mobilization as well as discursive production.
The graphic is a bit fuzzy – a bit clearer at the link.