The document discusses organic and paid growth strategies on Facebook. It summarizes RockYou's organic growth story and how they achieved 15 million users with no marketing. It then discusses RockYou's paid growth strategies using Facebook ad networks, noting they can generate 100-10,000 new users per day at $0.10-$0.30 per click or $0.15-$0.60 per installation. Key factors for viral growth include focus on new users, direct/indirect friends, and universal applications.