Some of the commentary around the N.B.A. finals assumes that most Americans are rooting for the Spurs to beat the Heat. That makes sense. The Spurs are a likable group, with an older core of players perhaps chasing a last title. And they’re trying to dethrone a team that was built in large part on big-name free agents, including one who took his “talents to South Beach.”

But even if more Americans will be rooting for the Spurs over the next week or two, there is little question that the Heat have more fans than the Spurs do. The map here is based on a large database provided to The Upshot by Facebook, which we used last month to create a national map of N.B.A. fandom.