Here's a very well done brief on Brand Personality: Communicating Character and Authenticity in a Digital World.
…consumers themselves play a part in creating and acting out the values that the brand represents. A strong community is a mutual collective based on interest, presence, respect and sympathy. In reality, customers are brand advocates who, in the new media universe, influence others who in turn
influence others, and so on. In this way a brand story cascades out via “the best
medium of all,” the consumer.