1) The document provides 6 tips for engaging tribes using social media: know your purpose, make and employ a map, support your tribes, use good netiquette, embrace serendipity, and measure, adapt and persist.
2) It encourages establishing clear goals for social media use and identifying the communities to connect with. Developing strategies like funnels or pyramids can help guide social media efforts.
3) Supporting existing communities by engaging where tribes already are and helping them achieve their goals can help build trust and influence. Following basic netiquette of being relevant, generous, and interesting can also help engage tribes.