Data mining at its finest
Facebook's Data Science team has combed the more than 35 million users who have "liked" a team's fan page, and put it into graphic form, down to the county level. Sean Taylor, who headed the research and analysis, was kind enough to send along the high-resolution maps.
Confirmation of the Steelers' nationwide popularity is the top five most common allegiances for Facebook friends of fans of each team.
Note Ravens fans have Steelers fans as friends but Steelers fans do not have Ravens fans as friends