Small Neighborhood

DeLong (with the help of an angel buddy) tracks the "internet neighborhood" of Ezra Klein, together with the neighborhoods of those who appear in Klein's neighborhood.    I guess it is interesting but I wonder what I am supposed to make of this?  I suppose there are several possible readings but I should think that one is: it is pretty damning evidence of the internet as "Daily Me"--a small circle of friends who provide good and interesting stuff to read but also go a long way to firm up each others' prejudices intuitions or convictions. Think of it: Klein, Yglesias, DeLong, Krugman, Drum, etc.--how long since you have seen any in this  crowd in a real ding-dong face-ripping cage match with any of the others?  Hah?  I ask you!  Perhaps the exception is Sullivan who always seems to get a bye for--I forget why Sullivan gets a bye; although in fact, his list may be the most diverse: he picks up Frum, Fallow and Greenwald, three of my own favorite stops who do not (unless I missed something) appear anywhere else in the magic circle.  

And BTW, where is Mark Thoma, or is he just the soup in which everybody else gets to swim (aka, Thoma's world, we just live in it)?