I tweet via @EricCrampton.
The new Twitter interface gives a list of folks similar to me. Or, at least it lists four different ones each time I refresh.
The first one that came up is @Offsetting. That's good. That's the account I use for tweeting posts from the blog. So it should be similar to me - it is me. I am similar to me. Twitter has proven identity. Good start.
Transitivity gets harder though.
I am similar to @wtdickens. Maybe a bit - he's a hell of a lot smarter than I am. I'm his Grandstudent via Bryan Caplan.
But @wtdickens is similar to @SFFedReserve, @stlouisfed, and @clevelandFed. Bill's a serious macro guy, so I can see how he'd be similar to a Fed. But I'm certainly not similar to a Fed. Transitivity fails.
I'm also similar to @jodiecongirl, who is similar to @Nudgeblog. Again, transitivity fails.
I wonder if there's any back end list of all the folks on your "similar to" list and their propensity scores (or whatever they're using for a matching algorithm).