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Why will karma based reputation system work?

What drives a karma based reputation system

1. Is it the competition to get more karma points and thus self feel superior to others 2. or the desire to have extra previleges and rights than others

( 1 comment | on HN )
Re:Why will karma based reputation system work? by tobylane on Wednesday May 25, 2011 @07:04AM (#2583548)
Risk and reward. Superuser/stackexchange is a much better example of it working well.