- The document discusses viral marketing and advertising strategies for social networks. It provides examples of how brands like FedEx and InStyle have successfully engaged audiences on social media through applications. - It emphasizes the importance of creating applications that entertain and engage users through clear branding, instructions, and integration with social media APIs and newsfeeds. Loyalty programs and notifications are also recommended to encourage sharing and accelerate virality. - The document concludes by outlining best practices for visual identity, search optimization, social media advertising platforms, targeted campaigns, and measuring success through analytics for social media application marketing.