We just dealt with one guy that just voted 2800 times from the same IP. Deleted the rows, and made it one vote per IP.

It works because to see a Yes/No it depends on if you have the cookie set, but to actually vote it checks the IP.

So if someone legitimately votes from a multi-user IP that already was used to vote, it'll show a Yes/No, get sent to the vote page, but won't go in–but it'll seem like it did :)

The biggest problem with one vote per IP is that you block pretty much all AOL users.

Seems like that could seriously skew the results ... I'd imagine a lot of people are trying to vote from behind home/small office routers.

Forest for the trees. This is primarily an advertisement, not an application. Accuracy doesn't matter.

What's the solution to this? No matter what you do, without a validation system (eg: verify email, credit card, etc), there's no way to differentiate between people.

Ha, someone just did that. We took care of it. It's fun to break apps, but 1000 no votes was a tiny bit much :-). She's not THAT bad looking. Regardless, were getting like 20 votes a minute legitimately.