Following is an abbreviated excerpt from Engage, a new book that helps businesses build, cultivate, and measure success in social media. Last year, Forbes magazine assembled a visual list for its Top 21 Twitter Tips to showcase business examples on how to use Twitter for marketing, service, sales, and ideation. The original compilation served as inspiration for a new list, one that helps businesses of all shapes, sizes, and focus embrace not only Twitter, but all social networks of relevance….