I really don't understand the map. It doesn't follow population density at all, which makes me suspect its veracity. For instance, two of the three "warm spots" in central Nevada are hovering over fairly small towns - one is in the general region of Ely (which I guess does have a federal prison, so maybe there's something to that one), while the other looks like it's over nothing - it's a little too far west to be Austin (which has less than 300 or so people anyway), and I can't think of any other towns in that area (edit: strike that, it may be Tonopah. Maybe.)
So are they really saying that there are more homophobic tweets coming out of the middle of nowhere than say, Los Angeles?