• Have a crystal clear passionate cause and message that the world can get behind.
• Have a name to embody the community.
• Have a clear set of operating principles and way of life.
• Communicate your core message in an inspiring and easy-to-digest way.
• Support a cause that embodies your message - Together.
• Make it incredibly easy for others to share the message.
• Bring people together in the real world.
• Showcase the positive change people are making.
• Take yourself out of the equation. Give the community a way to interact.
• Give people a way to identify each other. Have a uniform.
• Have a rallying cry (i.e. A pump-up song)!

(from Scott Dinsmore's liveyourlegend.net)