Personas or Metropath(ologies) is an installation by Aaron Zinmanis.
A component of the Metropath(ologies) exhibit, currently on display at the MIT Museum by the Sociable Media Group from the MIT Media Lab. It uses sophisticated natural language processing and the Internet to create a data portrait of one’s aggregated online identity. In short, Personas shows you how the Internet sees you.
Don't quite get the medical connection :) — but heck the internet is always right thought, ain't it. Sure must agree with Bnox, watching the data being crunched was very impressive.