I once accidentally self voted. I was using my friends account, then I had a brain-fart and clicked on that particular save. I thought it was cool, but having an enourmous brain-fart, I upvoted it with his account, and I didn't realize this until I looked at the post author, LinkinParkSuperFan. I almost passed the f*** out. Sure enough, I was later banned for like, a week or so. Damn.
If i may so say, i dont think its legal to track ip address without a consent of the user, and techincally you have to give user agreement to us so we have to agree to it, otherwise tracking the ip adress is considered illegal i think. just saying, maybe a user agreement