[Air-L] Twitter users by country?

[Amy Johnson]

Hey all,

I'm looking for a relatively recent (2014 or later) dataset that robustly estimates Twitter users by country* to contextualize other variables. If you know of such a dataset -- or of a researcher likely to know -- could you please contact me?

Many thanks!
Amy

*I'm looking for as close to ALL countries as I can get, not the ends of the spectrum.

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@shrapnelofme