This is pretty cool. It'd be really nice if you could see a ranking by state somehow (e.g. it's no surprise that C# is most popular in Washington, but it'd be cool to see what numbers 2, 3, 4, and 5 are short of manually de-selecting them in the dropdown menu).
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[ 22.9 ms ] story [ 537 ms ] threadSame map with github data would show very different results.