Talk to Contagious: Why Things Catch On like its author wrote you back.
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What it argues
Contagious is Jonah Berger's analysis of why certain products, ideas, and stories spread through word of mouth while others, equally good or better, remain obscure. Berger is a marketing professor at Wharton, and the book draws on his own research and a wide range of cases to isolate the principles that make things shareable. The central argument is that word of mouth is not random — it follows predictable patterns, and understanding those patterns lets you engineer contagious content and products.
Berger organizes his findings into six principles, packaged as the acronym STEPPS. Social Currency is the tendency to share things that make us look good — people share content that signals intelligence, taste, or insider knowledge. Triggers are environmental cues that keep an idea top of mind — the more your product is associated with common, recurring cues, the more often people will think of it and mention it. Emotion drives sharing — not just positive emotions but high-arousal ones like awe, anxiety, and humor. Public visibility matters because people imitate what they can observe. Practical Value drives sharing because people share genuinely useful information. Stories are the vehicle through which most information travels socially, and embedding your message in a narrative makes it more shareable and more memorable.
What it gets right
- 1.
Word of mouth is not random — it follows predictable patterns organized around six principles: Social Currency, Triggers, Emotion, Public visibility, Practical Value, and Stories (STEPPS).
- 2.
Social Currency: people share things that make them look good, feel smart, or signal insider status. Building social currency into your product or message makes it more shareable.
- 3.
Triggers are environmental cues that keep your product top of mind. The more often people encounter your trigger in daily life, the more often they think of and mention your product.
What it covers
Who wrote it
Jonah Berger is a marketing professor at the Wharton School of the University of Pennsylvania, where his research focuses on social influence, word of mouth, and how products and ideas spread. He has published dozens of academic articles and consulted for companies including Google, Nike, and 3M. Contagious, published in 2013, became a New York Times and Wall Street Journal bestseller. He has also written Invisible Influence and The Catalyst, which extend his research into persuasion and behavior change.
