This is hardly a surprise, but still sort of interesting to see in this kind of graphical format. In other not-too-surprising news, there’s this:
Blog readers seem to exhibit strong homophily. That is to say, they overwhelmingly choose blogs that are written by people who are roughly in accordance with their political views. Left wingers read left wing blogs, right wingers read right wing blogs, and very few people read both left wing and right wing blogs. Those few people who read both left wing and right wing blogs are considerably more likely to be left wing themselves; interpret this as you like.
The full paper is here.