[markbao]

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 :)

[jgilliam]

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

[callmeed]

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.

[scott_s]

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

[sam_in_nyc]

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.