First of all, I searched as the best and read all the questions that were appropriate, but nothing special It was not answered from This is not a duplicate, not a fixture. Obviously, if anonymity is allowed on a website, then there is no idiot to stop a person from voting more than once. However, I am thinking that with the experience someone can help me in tracking a completely unique visitor and coming in a reliable manner to vote against those credentials. Currently, I am ensuring that only one vote per item / session combo, it has been easily affected by restarting the browser, changing browsers / computer, or clearing your session data. goes. The recording against the IP seems to be the next reasonable solution but I am surprised that it will be very false positive (Many people whether there is a middle ground or some other method / combination What I see? I would rather take more data about the session without asking the question All (directly with browser, OS,...