Mark Schaefer and Sara Wilson dive into the red-hot world of brand communities. Who is doing it well and why? What are the challenges? What is the role of influencers and what's next? We'll explore that and more in this new episode.   Mark Schaefer is a strategy consultant, college educator, keynote speaker, and the author of 10 books including "KNOWN," “Belonging to the Brand,” and "Marketing Rebellion." His annual marketing retreat is The Uprising.   For more of Mark’s insights every week, subcribe to his award-winning blog. Mark also offers classes in personal branding and professional speaking.