The document outlines the top 10 mistakes companies make when using Facebook. These include posting too frequently, deleting comments, and not actively participating. Other mistakes are having unclear contest rules, only posting vanilla content, using private messages to promote, not sharing other's content, having a poor design, ignoring Facebook stats, and being obsessed with the number of likes rather than results. The document encourages mixing up post types, responding to comments, and focusing on engagement over sheer numbers.