For you data junkies, this is really cool. No big surprises here although as a Buffalo fan, I only know one person who is a cowboys fan. Everyone else are Steelers or Pats fans. I am sort of surprised that there aren't more Steelers fans in the DC area. I remember when the Steelers played a Monday night game against Washington, I saw a bunch of people walking out of our office building in Steelers jerseys.
Edited to add the non facebook page as well as further analysis done by Deadspin.