In How Do We Find Information In The Blogosphere? Tom Coates posits a "small world" pattern in the blogosphere (he doesn't call it that, but the effect is the same), the result being that even with a random search, we will be disproportinately directed to what he calls "high insight" blogs, meaning that users can understand the important issues being discussed in the blogosphere without reading 100% of the available weblogs.

This is related to Watts original work on small worlds networks, which have the following three properties: locally clustered, globally sparse, and low degree of separation among nodes. (Interestingly, the substrate required for Coates' information finding to happen is a small number of highly connected nodes, which, when graphed in rank order, typically exhibit power law distributions.)