It also geographic. There's a bunch of quizzes online where in 10 or 20 questions, it can tell you exactly what area in the US somebody is from. It comes down to the terms you use that you might not even realize are not universal. Highway vs freeway, what you call a sugary carbonated drink, and so on.
OTOH I think a lot of these methods don't matter that much because of plausible deniability. Stylometry and other stuff processes is always probabilistic, and can be dismissed.
