Contagious: Why Things Catch On
Jonah Berger —
Category: Adquisición de Clientes & Marketing
Contagious: Why Things Catch On answers an age-old marketing question with data: what makes people talk, share, and recommend? Berger analyzes campaigns, products, and everyday phenomena, distilling six triggers that predictably increase word-of-mouth diffusion—both online and offline.
What is it about exactly? The book demonstrates that “viral success” is rarely a matter of chance. Most of what we share happens outside of networks (face-to-face conversations) and is explained by social motivations and environmental design. To design messages and products that spread, Berger proposes the STEPPS framework. The STEPPS framework (the 6 levers of diffusion) Social Currency We share things that make us look good: exclusive, clever, surprising. How to activate it: “remarkable” traits, gamification with status, “insider info,” names/packaging that evoke pride in sharing. Triggers You need frequent reminders in the user’s context (days, places, routines). How to activate it: link your idea to everyday signals (“Friday,” “coffee,” “weather”), attaching your brand to an already established habit. Emotion High-arousal emotions (awe, anger, humor, anxiety) drive sharing. How to activate it: choose a central emotion and manage the tone; not everything needs to be “cute,” but it should be moving. Public “What is visible is imitated.” If behavior is seen, it gets copied. How to activate it: public usage signals (badges, recognizable formats), “Built to show” design (like the glowing apple on laptops). Practical Value We share utility: shortcuts, savings, clear tricks. How to activate it: brief lists, comparisons, “before/after,” discounts with “100 rules” (percentages vs. amounts based on price). Stories Stories are Trojan horses: people tell the tale and carry your message inside. How to activate it: build an anecdote where your product is key to the plot, not an extra tacked on. Rule: you don’t always need all six levers, but the more you activate coherently, the greater the spread. What you will learn with “Contagious” How to design messages and products with elements that people want to share. How to map triggers weekly/seasonally to keep your brand “top of mind.” How to choose emotions that move (and avoid those that lull). How to make usage visible to encourage imitation. How to turn utility into a shareable format. How to tell carrying stories (your idea travels within the narrative). Common mistakes the book helps you avoid Seeking “virality” with clickbait without value (brief spikes, damaged reputation). Relying solely on media payments without product/message design for word of mouth. Betting on low-arousal emotions (flat sadness) that do not drive action. Forgetting triggers (your campaign looks good one day and is forgotten the next). Stories where the brand is not part of the plot—people remember the anecdote, not you. Practical toolkit: 1) STEPPS Audit (15 minutes) Social Currency: What makes your offer noteworthy/proud to share? Triggers: What daily/weekly signals can remind you? Emotion: What specific emotion do you seek to provoke? Public: How does it look when someone used/bought it? Practical Value: What is the “useful trick” in 10–20 seconds? Story: What is the anecdote where your product resolves the twist? 2) Trigger Map Days of the week, times of day, weather, places, cultural events. Link copy/creatives to those contexts (e.g.: “Monday of X,” “with your coffee, do Y”). 3) Carrying Story Script Character with problem → your solution appears (key piece) → solves visibly → closure with benefit and social signal. 4) Shareable Utility Templates “5 shortcuts for ___ in ” “Printable checklist of ___” “Calculator/template” (quick and clear download) 5) Make it public Badges, visible “from this to that,” recognizable packaging, shareable formats (short GIF, before/after, QR). 6) Metrics that matter Share rate (shares/impressions), K-factor (invites and converts), % traffic from referrals, lift vs. control (A/B experiments), post-viral retention (did the value stick?). 7) Ethical safeguards Avoid optimizing with toxic outrage or unjustified fear. Verify truthfulness and context of claims; viral should not be synonymous with harmful. Signs that your idea is “contagious” (healthy) Growing mentions organized around triggers (weekends, events). Increased traffic from referrals and offline word of mouth (short surveys). People paraphrase your story and retain your key message. The curve not only spikes: it leaves a base (subscriptions/recurrent use). “Contagious” turns “let’s make it viral” into deliberate design: social currency, triggers, emotion, visibility, utility, and stories. If you build with STEPPS, your message not only travels further; it reaches better and leaves something worth sharing tomorrow.