Web application: the prohibition of multiple voting by the user


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First time doing writing a web application and have questions as correct to do this.

Here, for example, on habré the topic for you progolosovat only once. How it correctly to implement? Keep each topic a list of users who have voted? And if there are many objects, such as comments?
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Take a vote using SMS messages, and let them vote how they want :)
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Store
iduser+etopia
iduser+incomment
don't know how else
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conduct syslog to write all events to vote (and maybe along with others, such as writing messages/comments)
solve the problem and disposable vote, and a vote of type "once a day"
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