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Re:Ask PG: Is voting on HN anonymous? by cb5 on Saturday July 18, 2009 @07:49AM (#711673)
Not just could, but as the parent comment implied, given the nature of the system the answer is unequivocally yes.

The system serves to record the arrows you've clicked, therefore this information must be stored somewhere. Someone with access to this this information should be able to determine "what stuff an account upvoted," unless the system has been designed to obfuscate the connections(i.e. accounts & clicked items) at the database level.

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