The document discusses strategies for startups to build on top of large platforms to gain users and grow rapidly. It notes that while platforms are not there to specifically help startups, they can be beneficial for acceleration if used correctly. The key strategies are to 1) build products that provide clear value to users and incentives for the platform, 2) design products to work independently of platforms since platforms will change, and 3) use platforms for user acquisition and acceleration only, not as a primary distribution method or business model. Successful examples include Instagram, YouTube, and Dubsmash who leveraged platforms initially but became independent destinations.