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If there's a 5% false-positive rate, then if I give it an unidentified text and the posts from 1,000,000 identified Redittors, it's going to give me 50,000 poss

• tzs 10y ago
  That in and of itself would not be more than marginally useful or troublesome, but usually it won't be used by itself. Usually it will be combined with other evidence that you already have via Bayesian reasoning or intuition. For example, suppose someone is revealing on Reddit details about some business dealing of yours that should have only been known by people who are under NDAs. If you intersect the set of 50000 Redditors returned by the deanonymizing tool with the set of people under your NDA, and that intersection is not empty, then the leaker is probably one of the ones in the intersection.