When I heard the piece on NPR claim "The premise of Twitter is ..." i instantly though ACCORDING to who?! They only slightly stepped back from that statement at one point in the piece.
As I lay in bed, I felt the need to deconstruct the piece, but didn't. (That takes time your know. Glad someone else did (see the link). But at the end of the NPR piece (if you listen to it) they claimed a certain geographic commonality of Twitter in general (which i don't doubt). But led me to another question and something that i think would be an interesting follow up: who are the outliers? those who don't follow the pattern?
It would be interesting to study that, and where they might fall in comparison to Barabasi's Linked