How to identify unique user?

Posted by smotchkkiss on Stack Overflow See other posts from Stack Overflow or by smotchkkiss
Published on 2010-03-22T21:06:57Z Indexed on 2010/03/22 21:11 UTC
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Filed under:

uuid

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cookies

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best-practices

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visitor-statistic

How can you determine if a user is unique or not?

I understand there are many ways to do this using cookies, but what about methods that don't use cookies?

For example, go to Urban Dictionary and click one of the up/down vote buttons. Even if you delete your cookies and come back to the page, you will not be allowed to cast a vote on the same definition.

How do they do this?

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