One of the things I find interesting about my map is how little blue is on it. Everyone else's maps have actual dark blue in some or most areas, where I have dark blue only around Duluth, and a few patches of cyan here and there.
I wonder if it's because of affectations; I consciously use "y'all" even though it's not part of my native accent, because I feel that the lack of a distinct second-person plural pronoun is a major problem in English. I also consciously say "soda" rather than "pop" because... well, because "pop" just sounds, I guess, childish--certainly I grew up saying "pop."
Both of those things have very, very strong regional boundaries, and I wonder if that contributes to all the red on my map.
Looking at soda/pop maps online, this totally explains how St. Louis is listed as my best match! They're southern enough to say "y'all," and they have a penchant for saying "soda" despite being sandwiched between pop and coke. Crazy.