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billhodak

Re:Ask HN: How do you reduce fraud signups? on Thursday March 16, 2017 @04:29PM (#13888873)
Sift Science (YC S11) offers machine learning powered services for preventing fake account signups and promotion abuse. (Disclaimer: I work for Sift Science)

https://siftscience.com/products/account-abuse

https://siftscience.com/products/promo-abuse