Nova: Would you believe me if I told you that one of the most viral marketing campaigns in history involved a guy in a lab coat putting a brand new iPhone into a blender and turning it on?

Nova: Exactly. And that is the mystery we are diving into today. Why do some things—like a blender or a random pop song—catch on and spread like wildfire, while other really great ideas just... fizzle out?

Nova: That is the common myth, but Jonah Berger, a professor at the Wharton School, argues it is actually a science. In his book Contagious: Why Things Catch On, he breaks down the secret architecture of virality. He spent years studying why certain New York Times articles get shared more than others and why certain products get talked about at the dinner table.

Nova: There is. He calls it the STEPPS framework. Six specific ingredients that make an idea contagious. Today, we are going to deconstruct those ingredients and see if we can figure out how to make anything—even a boring office supply—the next big thing.

Nova: Let us start with the first S in the STEPPS framework: Social Currency. Think about the last time you shared a secret or a really cool piece of trivia. Why did you do it?

Nova: That is exactly it. People care about how they look to others. We want to seem cool, hip, and intelligent. Berger calls this Social Currency. If a product or an idea makes us look good, we are much more likely to share it. He uses the example of a bar in New York called Please Don't Tell.

Nova: Precisely. There is no sign outside. You have to know the secret. Because it is a secret, telling someone else about it gives you Social Currency. You are the person who knows the cool, hidden spot. By making the bar hard to find, they actually made people want to talk about it more.

Nova: It works because exclusivity makes people feel like insiders. But you cannot just rely on being cool. You also need the second letter in the framework: T for Triggers. This is about being top of mind.

Nova: Kind of. A trigger is a stimulus in the environment that connects to an idea. Berger talks about the song Friday by Rebecca Black. Do you remember that?

Nova: If you look at the data for that song, it has a very specific pattern. It peaks every single Friday. Why? Because the day itself acts as a trigger. Every time someone realizes it is Friday, their brain nudges them toward that song.

Nova: Right. Another great example is the campaign for Mars bars during the 1997 Pathfinder mission to Mars. Sales of the candy bar spiked, even though the company had nothing to do with the space mission. The news was constantly mentioning the planet Mars, which triggered people to think of the candy bar when they were in the grocery store aisle.

Nova: Now, once you have people thinking about your idea, you need to make them feel something. That brings us to E for Emotion. But here is the kicker: not all emotions are created equal when it comes to sharing.

Nova: You would think so, but Berger's research found something more nuanced. It is not about positive versus negative; it is about physiological arousal. Some emotions fire us up, while others shut us down.

Nova: Exactly. High-arousal emotions like awe, excitement, or even anger and anxiety make us want to take action—and that action is often sharing. Think about a video that makes you feel indignant about an injustice. You hit share immediately because you are fired up.

Nova: Exactly. On the flip side, low-arousal emotions like sadness actually decrease sharing. If a story just makes you feel heavy and tired, you are less likely to pass it on. This was a huge insight for charities. Instead of just showing sad images, they found more success by evoking awe at the progress being made or anger at the situation being allowed to continue.

Nova: P stands for Public. This is the idea that if something is built to show, it is built to grow. We have a tendency to imitate what we see others doing. Psychologists call this social proof. If you see a long line outside a restaurant, you assume the food is good.

Nova: Spot on! Apple actually wrestled with that. Should the logo face the user when the laptop is closed, or should it be right-side up for everyone else when it is open? They chose the public facing version because it serves as an advertisement.

Nova: You have to make the private public by creating a visible signal. Think about the Movember foundation. Men growing mustaches in November for prostate cancer awareness. A mustache is a walking, talking billboard. People ask, why are you growing that? And suddenly, a private health issue becomes a public conversation.

Nova: We are down to the final two: Practical Value and Stories. Practical Value is probably the most straightforward. People like to help others. If we find a piece of information that is genuinely useful—like a life hack or a great deal—we share it because we want to be helpful.

Nova: Exactly. It provides immediate value. Berger highlights a video of an elderly man showing how to shuck corn cleanly. It was just a simple, useful tip, but it got millions of views because it solved a universal, annoying problem. Useful things are contagious because humans are inherently social and cooperative.

Nova: That leads us to the final S: Stories. You have to wrap your message in a narrative. Berger calls this the Trojan Horse. You know the legend, right? The Greeks couldn't get into Troy, so they built a massive wooden horse as a gift, hid soldiers inside, and the Trojans pulled it right through their own gates.

Nova: Exactly. People don't share ads; they share stories. But the key is making the brand or the message integral to the plot. If you can tell the story without mentioning the product, the story isn't doing its job.

Nova: Think back to our introduction—Will It Blend? The story is: Can this crazy blender destroy an iPhone? You can't tell that story without the blender. The blender is the hero. If the blender was just sitting in the background while someone told a joke, the video might still go viral, but no one would remember the brand.

Nova: Right. You want your brand to be the reason the story is interesting in the first place. Another example he uses is the Subway Jared campaign. The story was about a man losing hundreds of pounds by eating sandwiches. The sandwiches were the essential part of the narrative. You couldn't tell the story of his weight loss without mentioning what he ate.

Nova: Now, Leo, Berger wrote this book a few years ago, before TikTok became the behemoth it is today. But if you look at modern social media, the STEPPS framework is more relevant than ever.

Nova: The algorithm is really just a mirror of human behavior. It prioritizes what people engage with, and people engage with things that have these six ingredients. Look at TikTok trends. They are the definition of Public and Triggers. You see everyone doing a specific dance—that is Public—and a specific song snippet acts as the Trigger.

Nova: Exactly. But there is a challenge today that Berger touches on: the difference between online and offline word of mouth. We often think virality is all about the internet, but Berger points out that only about seven percent of word of mouth actually happens online.

Nova: It surprises everyone! But think about your day. You talk to your partner, your coworkers, your friends at coffee. Most of our conversations are face-to-face. Online word of mouth is more visible, so we think it is more important, but offline is where the deep influence happens.

Nova: Precisely. And that is why Triggers are so important. You might see a cool ad on your phone, but if there is no trigger to remind you of it when you are actually out in the world, you will never talk about it.

Nova: That is a valid critique. There is a risk of what people call empty virality. You can use these tools to spread a message that has no substance. But Berger's argument is that these principles are neutral. You can use them to sell a better blender, or you can use them to spread a life-saving health tip or a movement for social change. The tool doesn't care what you are building; it just helps the building be seen.

Nova: We have covered a lot of ground today. From secret bars and expensive cheesesteaks to the physiological arousal of anger and the utility of corn shucking.

Nova: That is the best way to learn. The core takeaway from Jonah Berger is that virality is not magic. It is not about having a huge marketing budget or being a creative genius. It is about understanding the basic human psychology of why we share. We share to look good, we share because we are reminded of things, we share because we are fired up, we share because everyone else is doing it, we share to be helpful, and we share because we love a good story.

Nova: Exactly. Just remember: build it to show, make it a story, and give people a reason to feel like an insider. If you can do that, you don't need luck.

Nova: Just make sure the message is inside the horse! Thank you for joining us for this deep dive into Contagious by Jonah Berger.

Nova: This is Aibrary. Congratulations on your growth!