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I think article this may be too sparse in details for a subject that so important. For better resources, please see: http://www.bokardo.com http://www.bokardo.com - for design of social interfaces (please read everything you can, it's not that much) and http://buildingreputation.com/doku.php?id=bryce http://buildingreputation.com/doku.php?id=bryce (for reputation systems. Bryce is the man here.)