Berger writes about why certain stories, videos, products, and ideas spread and why others don't. He describes six principles that cause things to spread: Social Currency (does it make us look smart? cool?), Triggers (are we prompted to think about a product?), Emotion (do we care?), Public (can people see us using this product?), Practical Value (is it useful?), and Stories (what's the narrative around this idea or product?).
I listened to this book as an audio book. I've never read a book on marketing, so this was my first introduction to how to think about spreading the word about an idea or product. I thought more about the influence of word of mouth recommendations.
Overall, I liked listening to this audio book. It was fun and educational.