Contagious

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• Things spread because of how they are built, not because of luck or budget
• People share what makes them look good and what is top of mind
• High-energy emotions like awe and anger drive sharing; sadness shuts it down
• Make private behaviour visible and give people useful things to pass on
• Wrap your idea in a story people want to retell

In deze bit

1. Why some ideas spread and others die

   Why would a Philadelphia restaurant sell a 100-dollar cheesesteak? Not to sell many of them, but to get people talking, and it worked, because the story travelled far beyond anyone who ever ate one.

2. Social currency and triggers

   People share things that make them look clever, connected or in the know. That is social currency.

3. Emotion and the public eye

   When we care, we share, but Berger found that not all feelings are equal. What matters is arousal, the physical activation a feeling produces.

4. Practical value and stories

   People love to help each other, so useful things spread. A video showing a trick for shucking corn, a list of foods that keep well in a Delhi summer, a deal that saves real money: all of these get passed along because sharing them feels generous.

5. Designing for word of mouth

   The deeper point of the book is that these 6 principles are a design checklist, not a list of lucky accidents. Before launching anything, Berger suggests asking: does this give people something remarkable to say, is it linked to a frequent trigger, does it stir a high-energy feeling, can others see it being used, does it help people, and is there a story wrapped around it?

6. Put it to work

   This week, pick one product, post or project you want more people to talk about and run it through the 6 principles, giving yourself an honest score on each. Find the one remarkable detail that makes someone look smart for sharing it, and put that detail at the front of your message.