“A company’s success on Facebook revolves around three factors: ability to maximize viral channels (to drive new users), the ability to create an effective internal engagement loop within an application, and access to an open communication channel with Facebook’s platform people.”
http://www.allfacebook.com/2009/09/the-zynga-influence/
- Have something to drive new users (Attract)
- Work to keep new and existing users engaged and happy (Engage and Extend)
- Good relationship with the platform owner to stay live and ahead of the curve
