The webinar discusses the importance of developing and engaging proprietary audiences as a top marketing priority. It promotes the concept of the "Audience Imperative", which is focusing media efforts on growing, engaging, and retaining audiences over the long run. The webinar features speakers from ExactTarget and ethology who will discuss how challenger brands can compete through audience development and how research and audience growth can drive branding, sales and loyalty. The webinar aims to teach attendees how to adopt the Audience Imperative approach and emphasize the importance of audiences as business assets.