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NSAOfficial ago

Not sure IP addresses are a good idea. Some of us use Tor, which has (IIRC) several IP addresses, and there's always a chance two or more people could get the same address at some time.

Calorie-Kin ago

So much this. I think a better idea would be session IDs. They're non identifying and unique per visit. Something stored as a cookie or something. Link a username to a cookie, and check if said cookie is around when the user is logging as another account. This way, someone who tries to brigade or manipulate votes would have to delete their cookies each time, which makes it uncomfortable, and not as many people will go through the trouble.

7veils ago

Self Destructing Cookies kills cookies immediately after leaving a web site.