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Brian Solis of outline a most comprehensive look at the Twitter Eco system:
Ring 1: Branding
Ring 2: Geographics
Ring 3: Interest Graph
Ring 4: Dashboard
Ring 5: Event Management
Ring 6: Live Streaming
Ring 7: Geo Location
Ring 8: Relationships
Ring 9: Marketing and Advertising
Ring 10: Rich Media Ring 11: Communication Management
Ring 12: Research and Analysis Ring 13: Stream Management
Ring 14: Mobile Applications Ring 15: Trends Ring 16: Social CRM
Ring 17: Influence and Resonance
Ring 18: Twitter Search
Ring 19: Causation
