From 2000-2006 I ran the world’s largest psychological testing website — Tickle.com. We had 5 psychology and statistics PhDs on staff at the company, and our goal was to develop a system for understanding human motivations in order to get products to go viral.

The project was essentially a success. Over years of studying psychological research and running experiments, we mapped 27 human motivation clusters, many of which help when trying to get people to share your product.

Putting these learnings into practice, we were able to virally grow our user base to more than 150 million people when there were only about 1B people on the internet.

Since then, we’ve continued to apply what we learned to help startups grow.  What I’ve learned is that the foundation of viral growth is rooted in motivational psychology and language. The growth channels change, but this stays the same.

Today we want to share 8 motivation clusters we found that cause people to share, so you can engineer them into your product, marketing, and DNA of your company.

Baseline Viral Thinking

Each of the motivations we discuss below may or may not apply to your product. But there are several things that always apply.

First, is our pack animal psychology. Humans are constantly thinking about status, how we’re perceived, or where we fit in. Those constant mental loops serve as the foundation of our motivations to share. We all worry about how sharing will make us look.

Second, sharing has friction – aim to reduce it. Design your product so that it minimizes the effort and thinking required to share.

Third, think about how your product is broken unless people share. If they can’t get the utility that they want, they will look for ways to share to get it.

Fourth, make your language about the user, not about you. This is very challenging for most people, who are proud of what they have built and want to be recognized by users for their accomplishments. But this is juvenile. As product people and marketers, you have to transcend your own self-interest in favor of your users’ own self-interest. It’s more generous and more effective.

In short, when any of us consider sharing something online or offline, we unconsciously make a trade-off between benefit and costs:

1. How might sharing this benefit me (the sharer) or you (the audience/recipient) either via utility or via status/reputation?
2. How much time and effort (friction) will I have to spend to share this?

The differential between 1 and 2 will give you higher conversion to sharing, and A/B testing can help you with that differential. Growth tactics often focus on this.

Understanding psychological motivations expands your toolkit to maximize the benefit side of the differential and really speak to your users.

8 Clusters of Motivation That Trigger Sharing

Here are 8 motivations that trigger sharing. There are more, but these give you a good starting point. If you want to do more research, track down writings on the subject by Freud, Maslow, McClelland, Murray, Costa & McCrae, and Erhard.

With each cluster, we’ve chosen a word that we think best represents the core motivation. In each case, we also list the other terms we’ve found similar. We include them all because each word could trigger a different idea in your mind as you think about how it could apply to your product or marketing.

1. Status

This is the big one. It can also be termed “belonging,” “prestige,” “respect,” “scarcity” or “in-the-know.” People often try to show this by associating themselves with other high-status people or central nodes in the network. Most of us intuitively understand that high-status nodes in a network tend to mostly associate with other high-status nodes.

They also try to show this by joining exclusive products, like Facebook was at the beginning, when they were just in colleges.

People also try to show their status within products. On social media, people share the accomplishments of their friends, for instance, congrats for making 30 under 30, raising a $X million VC round, getting a new job. They are happy for their friends, but they also do this publicly because of how it makes them look by association. The same thing is true in a CRM where you put in the data that makes you high status among the sales team.

Status is scarce because it indicates the hierarchy of us in the pack. There is only one top position, one 2nd position, etc. Access to something scarce or exclusive motivates people to share because they can get high status from the people they share it with.

Note that despite the high-profile cases where this has worked, very few products can achieve high enough status at launch for scarcity tactics to work. Scarcity typically works more easily for things like discounts or tickets that are limited in number or time.

2. Identity Projection

Other words in this cluster include: “tribalism,” “vindication,” and “confirmation bias.” We want to be able to show who we are and be vindicated in our identity.

This motivation is especially visible with outrage-sharing on social media. When we express outrage around something, we’re drawing a clear line around what we aren’t. This is the reason why so much of what people share online is in the camp of “I told you so” or “this vindicates my perspective.” “I’m right.” “My team is winning, so I’m worthy.”

Sharing an outraged Yelp review or political Facebook post helps us define what we stand against, and by implication what we stand for.

It gives us an opportunity to have a point of view — a statement that people can agree with or disagree with. We mostly seek validation in that point of view. Sometimes, however, interestingly enough, we share to help us explore our own identities, or to explore the identities of others. To see who has a like-mind.

This is a manifestation of tribalism. We want to be part of the pack, and when we share, it is sometimes to either A) signal that we belong via association or rejection of something else, or B) help us find our tribe in the first place.

3. Being Helpful

“Utility.” “Better.” “Cheaper.” We are compelled to share things that we find useful because we want to be perceived as helpful and nurturing to our tribes. It feels good to be looked at as someone who is competent and knows what you’re doing.

Whether that be a new product that we feel really improves our lives by producing a lot of value or something that produces that value at a lower price.

For instance, in the early days of Airbnb, people were motivated to share the product because it produced so much cheap value for them as users, and they wanted to share that utility with their friends. The same thing was true of Salesforce in the early days, $50/month for a CRM in SaaS form.

Note that language is important here, especially if your product provides some new or unprecedented utility. If you can give your users the language to express the utility of your product in a clear, pithy, and compelling way, it will 10x the word of mouth. (But don’t get too pithy – remember, your line should describe what you mean to the user, not a cool tagline about yourself).

It’s the difference between saying “access an online rideshare marketplace” and “get a ride in 3 minutes.”

4. Safety

“Fear.” “Compliance.” “Prevent harm.” “Security.” Fear is embedded in the most primal part of our psychology. If we sense danger, our brain has evolved to pay attention.

Any perceived threat to safety — whether physical, financial, or emotional — can be a powerful reason why people share. News media have long understood this. As they say in the biz, “If it bleeds, it leads.” And it’s why the clichéd way for the 6 pm TV news to get you to watch their 11 o’clock news is “Are your children safe? News at 11.”

Products that offer safety or security are shared because of the same emotions. For example, Nextdoor’s early growth came from people wanting to know what was going on in their neighborhood and what kind of threats to their safety they might face. The app Citizen grew for a similar reason, and it was also why Trulia’s crime map helped them grow.

Related to safety is compliance — people are highly motivated to prevent harm and maintain stability. Customers of compliance SaaS software, for example, will be motivated to share with others in their company so that they can be perceived as wanting to prevent harm and being a protective, stabilizing force.

5. Order

“Organize.” “Collect.”

One of the Big Five personality traits is conscientiousness. This is a spectrum. Some people like to be highly organized and efficient, and others are naturally messier.

People who are trying to organize their world because of their personality are highly motivated to share tools that help them to optimize and organize.

This is one of the big drivers behind the rapid growth of a cult-like following behind apps like Notion, which have been virally growing for the past few years. It is the same thing that drove the growth in the early days of productivity software like Asana and Airtable.

People share them not only because it makes others perceive them as more organized and efficient, but also because it helps them bring other people into the same protocol of organization— whether it be co-workers or friends and acquaintances.

6. Novelty

“Entertainment.” “The new.”

Another aspect of the Big Five is openness to experience. Do you seek novelty, or do you prefer caution and familiarity?

The attraction of novelty was identified early on by Wilhelm Wundt, one of the founders of modern psychology who came up with the Wundt curve — a bell-curve distribution between novelty at one end and familiarity at the other.

The sweet spot is in the middle — we are attracted by things that are new enough to not be stale, but not too new to be strange.

This novelty sweet spot can be seen in internet memes, where people share remixes of the same formulas which contain elements that are both familiar and new. Delightful in their new context, but ultimately a remix of old, familiar information. Completely viral combination.

At some arbitrary point, the meme moves past the sweet spot and becomes stale, after which people stop sharing it because they’ll be mocked for being behind the curve.  Why? The equation flips. The threat of being perceived as behind outweighs the benefit of sharing. The meme is over.

People also tend to share things that are entertaining because the risks are low and it allows people to interact and bond in ways that feel safe and warm.

The threshold to send something drops if you know it’s going to be entertaining or fun. The perceived risk of sharing something entertaining is always low, while there’s a clear benefit of being perceived as having good taste.

Competition makes entertainment virality a difficult motivation to capture. Worst of all, it’s very hit or miss and then fleeting even when you do hit.

You often need to create 50 pieces of novel, entertaining content before one “hits” and then it typically lasts for a few days or weeks before it gets forgotten in the market under a torrent of new novel pieces.

7. Validation

“Positive.” “Happy.” “Smart.” A lot of what we share online has to do with the fact that we want to get a boost, believe we are good, believe we’re smart, or believe we’re worthy. We want to feel positive about ourselves and our place in the world.

At Tickle, we noticed this a lot with personality tests. People shared their results because they wanted to be validated and boost their self-esteem. Even today, people are often eager to share the results of their Myers-Briggs or Big Five personality tests with their friends because they seek that validation.

You want to know what people think of you, and you will share products that help you do that. You also want to feel positive and uplifted.

8. Voyeurism

“Window.” “Schadenfreude.” “Access.” There are two related motivations that cause people to share out of voyeurism.

On the one hand, you have vicarious enjoyment. People share things that allow others to vicariously live through them, whether it’s instagramming their food and vacations or sharing a product unboxing on YouTube.

On the other hand, there’s schadenfreude. People are highly motivated to share things like celebrity scandals, gossip about high-profile people, or people they don’t like because it helps unite them with others in common judgment/disdain.

Although this isn’t pretty, it’s two sides of the same coin. Voyeurism is a powerful motivation in why people share.

Always Return to the Psychology

Understanding the psychology of why people share is one of the keys to unlocking growth. Experimenting with language to connect with these motivations is the work to be done.

Too often, we focus too much on A/B testing, optimizing conversion funnels, landing pages, and app designs, while overlooking the real psychological and language fundamentals that motivate users to share (or not).

Understanding and applying the psychology of why people share is the Pareto Principle of marketing — it’s the 20% of what you do that leads to 80% of the growth.