I mean, I've seen it done on other forums completely blindly (you can't even see the results at all, let alone who voted for who), to eliminate the prospect of people coming in & just voting for whoever the majority is voting for. I can understand that, because it forces everyone to think for themselves, it has some logic behind it & makes it more realistic anyway.
But if you're going to make results visible, I don't see why it needs to be private. But whatever, it's already done with.
