The NYTimes has an interactive map showing how people are connected by Facebook, which allows them to show the impact of distance: briefly, our friends are close, physically. The data is at the county level, so they can show which counties people in Fairfax county are closest to (all VA counties plus DC, no MD counties).
It's good to play with. As their final analysis, they show how the US divides if you divide areas by closeness of connections. So if you divide the US into 2 parts, they're Hawaii and the rest of the country. As a failed historian, I was fascinated to see that only at the 20 part division did the Mason Dixon line show up.
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