The document discusses how startups can use social media to build communities that support their products or services. It recommends starting small by focusing on one platform and being consistent in building a following over time. The key is engaging with others in the community by having a personality and sharing emotionally-connecting content. Tools like Twitter, Google+, and Pinterest searches can help find potential customers to target. Nurturing the community requires optimizing content for sharing, connecting users to each other through the product, and continually testing different strategies on social media. The most important things are focusing on consistency and tailoring the approach to the specific startup's community.