This is an important distinction, as it would seem to suggest the Russians didn't upload target voter universes.https://twitter.com/kantrowitz/status/915699561842089985 …
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Hard to know what this means without info. Could go back to voter rolls. (also voter rolls aren't the best way, just making the tech point).
and there is no way to do one-to-targeting specifically. Interestingly, it's actually a lot more powerful than that.https://developers.facebook.com/docs/marketing-api/buying-api/targeting …
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