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I agree that email validation is flawed in terms of ensuring uniqueness, so this is something I may drop and insist users create an account. One thing I have considered in the mean time is allowing registered users to hide non-signed in participants.

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That'd be better. Make the default action when voting "vote as anonymous, unless logged in", and upgrade that anonymous vote to a registered one if the user decides to register after voting.

Also, having an account is not ensuring uniqueness either.

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