Contagious: Why Things Catch On by Jonah Berger

Description

If your growth depends on referrals and word of mouth, this is the foundational read. Wharton professor Jonah Berger distills years of research into six principles he calls STEPPS: Social Currency, Triggers, Emotion, Public, Practical Value, and Stories. The core idea is that virality isn’t luck or charisma; it’s a set of repeatable, testable levers you can build into your product and content. It’s especially relevant if you run a referral program and want to understand what actually makes people talk. Honest caveat: it’s more explanatory framework than step-by-step tactics, and some case studies now feel dated. Read it for the durable mental models, then apply them to your own campaigns.