The curves of false-acceptance vs false-rejection rates usually overlap, even in their optimum. I do not envy a billion-user-level website like Twitter having t

The curves of false-acceptance vs false-rejection rates usually overlap, even in their optimum. I do not envy a billion-user-level website like Twitter having to deal with this. Automation is probably still better than trying to do this manually and failing even more? Who knows, though.