1/ They create a built-in source of real-time user feedback, which is critical for building a product people really want. 2/ They foster friendships rooted in an affinity for your product, which drives lifetime value and new customer referrals.
1) The community quadrant (to understand how community differs from other groups of people who interact with a product) 2) The community funnel (to understand what makes a community compelling to prospective members).