Where Do Friends Come From?

It was one of those summers that, much like all the ones before it, felt carefree, intense, filled with laughter and adventures, and packed with memories that still bring a smile to my face today. On the surface, everything seemed exactly as it always had. Yet as the end of the holidays approached, each of us began to feel a strange sense of unease about what would come next. For seven years we had seen one another every day in the same school hallways and on the same playgrounds. Now, however, the moment had arrived when choosing different high schools would send us down different paths. 

I still remember a trip to the beach when my friend's older brother, then a future high school senior, casually remarked: “In a year or two, you'll have completely different friends, and if you still see each other, it'll only be by chance.” We laughed off his gloomy prediction at the time, partly to hide our own concerns. And we react in the same way today whenever we recall those words, sitting almost in the same place and with almost the same group of people around us. 

We went to different schools, scattered across various parts of the country for university, chose different careers and places to live, met different people, and started families of our own. Yet more than twenty-five years later, we are still the same close-knit group of friends who understand one another almost without words. It could easily have turned out differently. If our parents had enrolled us in different schools. If we had not ended up in the same classroom. If the PE teacher had not picked us for the same team. If, on that afternoon after school, we had chosen a different playground. It would be tempting to say that our friendship was largely a matter of chance. But in those very same situations and under those very same circumstances, we met countless other people with whom we simply never clicked.

So where do friends really come from? Why is it that, out of all the people we meet throughout our lives, only a handful remain with us for years? What makes some people feel closer to us than others and earn our trust? And is there some kind of formula for friendship, or is it one of those things that can never truly be planned or predicted? 

Is It Friendship Yet, or Just Mutual Liking? 

If the chances of forming a friendship depended solely on the number of people we meet, most of us would have little reason to complain. Over the course of our lives, we encounter hundreds, sometimes even thousands, of people. We meet them at school, university, work, on holiday, during courses, training sessions, and family gatherings. Some remain in our memories for years, while most disappear from them almost as quickly as they arrived. Researchers studying social relationships have long observed that the number of truly close people in our lives is surprisingly small. British anthropologist Robin Dunbar estimated that although we can maintain contact with around 150 people, our innermost circle of trust usually consists of only a handful. These are the people we call when something important happens. They are the ones we entrust with secrets we would never share with others. They are the people with whom we want to celebrate our successes and share our failures.

So, what makes someone from among our acquaintance’s “graduate” to the status of a friend, and when does that transformation take place? Psychologist Jeffrey Hall from the University of Kansas set out to determine exactly how much time it takes for a causal connection to develop into a genuinely close relationship. His findings were surprising. Building a solid friendship requires, on average, around 90 hours of shared time. For the closest relationships, that number more than doubles. Importantly, this does not mean simply sitting next to someone in a classroom or at a desk in the office. What truly matters are voluntary interactions — conversations, shared experiences, common hobbies, and spontaneous get-togethers that take place outside school, work, or other obligations. Hall’s research challenges the popular belief that meaningful relationships are created by a single magical moment or instant chemistry. More often, they are the result of a gradual process during which trust, a sense of safety, and mutual understanding slowly take shape. 

Trust is precisely what psychologists most often point to as the boundary separating simple affection from something much deeper. At a certain point, we stop worrying about the impression we make on the other person and begin saying what we genuinely think. We devote less energy to managing our image and more to having honest conversations. Perhaps that is why it is so difficult to identify the exact moment when friendship begins. The most important relationships are rarely born from a single life-changing event. More often, we recognize their significance only later, when we realize that there are things we would tell this person that we would never share with anyone else.

Where Do Friends Come From?

If building a close relationship requires dozens — or sometimes even hundreds — of hours of shared experiences, another question naturally follows: where do the people with whom we spend that time come from? Although we like to think of friendship as the result of conscious choices, research suggests that chance plays a far greater role than we might expect. Back in the 1950s, American psychologists conducted a study in a student residence associated with MIT. They discovered that the strongest bonds most often formed between people who lived closest to one another. Neighbors in adjacent rooms became friends more frequently than those separated by just a single floor. Students living near staircases, entrances, and mailboxes — places through which dozens of people passed every day—had even greater chances of developing friendships. 

The conclusion seems straightforward: the more often we encounter someone, the more likely we are to start liking them. Psychologists call this the proximity effect. It may not sound particularly romantic, but many of our most important relationships begin in exactly this way — by sitting in the same classroom, living in the same neighborhood, or working a few desks apart. School friendships often emerge simply because we spend years seeing the same people almost every day. At university, residence halls, lecture rooms, and shared apartments take over the role once played by school corridors. Later in life, workplaces, sports clubs, and neighborhood communities often serve a similar function. Contrary to what we might think, the place where we first meet someone is usually less important than what happens afterward.

Many people look back and say they met their best friend by pure chance. Psychologists would probably agree — but with one important qualification. Chance may bring two people together for a moment, but it cannot sustain a relationship on its own. Whether a connection endures depends not on luck, but on whether both people discover that they genuinely enjoy each other’s company and come to value one another’s presence.

The proximity effect helps explain why certain people enter our lives in the first place, but it does not explain why some of them stay. If frequent contact alone were enough to create friendship, most of us would maintain close relationships with every classmate, neighbor, or coworker we have ever known. Yet that is clearly not the case. Out of the dozens of people we encounter every day, only a few draw us in enough to make us want to know them better. Psychologists have long argued that similarity plays a major role here. This does not simply mean sharing the same hobbies or musical tastes. More important are common values, a similar sense of humor, comparable ways of thinking, and familiar reactions to life’s challenges. These are the qualities that make us feel at ease around certain people and give us the sense that we are somehow on the same wavelength. 

As We Grow Older, We Value Friendship More — But Find It Harder to Build

If friendship requires time, shared experiences, and regular contact, it is not difficult to understand why so many people say it was easiest to make friends during childhood and adolescence. School and university functioned as social accelerators. We saw the same people almost every day, experienced similar emotions, faced the same challenges, and had countless opportunities for spontaneous conversations. Adulthood looks very different. Time becomes a scarce resource. Careers, relationships, children, mortgages, and everyday responsibilities gradually reduce the space available for nurturing meaningful connections.

It is no coincidence that research shows the number of close friends tends to decline with age. Paradoxically, this does not happen because we stop needing other people. Quite the opposite. As we grow older, we often come to appreciate sincere and lasting relationships even more. The problem is that it becomes increasingly difficult to create the conditions in which such bonds can develop. After all, it is hard to expect a close connection to emerge when we see someone only a few times a year and limit our interactions to brief exchanges whenever our paths happen to cross. 

This does not mean, however, that people in their thirties, forties, or fifties are destined to rely solely on friendships formed long ago. The real paradox is that most adults fully understand how important close relationships are yet regularly postpone investing in them. When time is short, meeting friends is often the first thing we cancel. When we are tired, we call off a weekend trip. When our schedules become overloaded, relationships tend to lose out to obligations.

And yet nearly every major study on well-being points to the same conclusion: meaningful connections with other people are among the most important sources of life satisfaction. Perhaps, then, the greatest challenge today is not finding potential friends but reminding ourselves that friendship—much like health or family — requires time and attention before it begins to bear fruit.

Not Everyone Has to Become Our Friend

Simply making time for other people does not automatically guarantee meaningful relationships. Equally important are the expectations we bring into them. Many of us are not really looking for friends — we are looking for ideal friends. People who will understand us without words, share our interests, support us through difficult moments, and always make time for us. Yet no universal model of the perfect friend exists. It is true that we tend to connect more easily with people who share our values, sense of humor, or outlook on life, but even that offers no guarantee of a lasting bond.

All it takes is a glance at our own social circles to see how different we often are from one another. Expecting a single person to satisfy all our social needs would be like expecting one film to be the greatest comedy, thriller, romance, and action movie at the same time. Perhaps this is why the strongest friendships are not built on perfect compatibility but on accepting that different people bring different things into our lives.

In the 1970s, sociologist Mark Granovetter argued that we tend to overestimate the importance of our closest relationships while underestimating the value of looser connections. He called these “weak ties.” They include people we like, respect, and stay in touch with regularly, but who do not belong to the small group that knows all our secrets. A former coworker, someone from a language course, a neighbor we often meet on walks, or the parent of a child who frequently spends time with our own son or daughter. Such relationships rarely form the emotional foundation of our lives, but they serve a different — and equally important — purpose. They are often the connections that expose us to new environments, experiences, and perspectives. Through them we meet new people, discover new interests, and step beyond the limits of our usual social circles.

Granovetter even argued that many of the most significant changes in our lives begin thanks to people who are not part of our closest circle. These are often the individuals who introduce us to new opportunities, connect us with others, and draw us beyond the environments we inhabit every day. It is worth remembering this because not every valuable relationship has to develop into a deep friendship. Not every acquaintance needs to become the keeper of our secrets. Some people enter our lives to teach us something, inspire us, or reveal possibilities we would never have noticed on our own. Do we really need to call all of them friends? Even without that label, they can play an important role in who we become. 

Number of Friends + Number of Followers = Number of Friendships?

If not every meaningful relationship must develop into a deep friendship, it is worth asking another question: are we still able to clearly distinguish one from the other? In the age of social media, those boundaries have become far more blurred than they once were. Facebook has long referred to our contacts as “friends,” Instagram counts our “followers,” and every new platform encourages us to continuously expand our network. As a result, it has become increasingly easy to assume that the quantity of our connections matters just as much as their quality. Hundreds of names on a friends list or thousands of followers may create a sense of social popularity, but they reveal very little about how many people truly know us — or how many people we truly know. A simple thought experiment is enough. If we suddenly needed help, support, or honest advice, how many of those online contacts would come to mind first? The answer is usually far smaller than the numbers displayed on a smartphone screen.

This does not mean, however, that Facebook or Instagram are enemies of friendship. Paradoxically, they often help us maintain relationships that, twenty or thirty years ago, might have faded after someone moved to another city or country. Social media makes it easier to remain part of the lives of people we no longer see every day. The problem begins only when online interaction starts replacing real-world connection. Liking a photo requires far less effort than having a conversation. Sending an emoji is easier than making a phone call. A brief comment under a post cannot replace an afternoon spent together.

Social media is therefore an excellent tool for maintaining existing relationships, but it is far less effective at creating the deepest ones. Last year, a survey conducted by CBOS asked Poles aged 18 to 44 about their social media habits. People who spent less than one hour a day on social platforms reported having, on average, five close friends. Those who spent more than five hours online each day reported having only three. Equally important, longer social media use was associated with lower self-assessments of mental well-being. The findings do not prove that social media destroys friendship, but they do suggest something worth considering: no number of likes, followers, or online interactions can fully replace the value of genuine human connection.

Four Friends May Be the Norm, Though One Is Often Enough 

Can we therefore assume that the fewer friends we have in real life, the worse our well-being becomes? To some extent, yes — but what matters most is simply the presence of another person, not necessarily a friend. In another CBOS survey, Poles were asked with whom they most enjoy spending their free time. An overwhelming majority (89%) pointed to family members. Slightly fewer chose a partner, husband, or wife. Only 12% of respondents said they feel happiest in the company of close friends.

Based on these findings, one could conclude that we place love above friendship, which is hardly surprising. Among people in relationships, only around 6% spend most of their free time with friends. Among singles, that figure rises almost fivefold. The value and significance of friendship therefore do not appear to be fixed. They largely depend on the stage of life we are in and on which relationships occupy the most important place in it at any given moment.

That does not change the fact that—whether we live alone or share our lives with someone else — we all prefer to surround ourselves with people we trust, genuinely like, and can rely on for support when needed. As many as 97% of Poles report having at least one friend, and the average person in Poland counts nearly four people among their closest companions. According to one American study, that is almost exactly the number we need.

The same study found that around four close friends is the number most strongly associated with lower levels of loneliness. Two close friendships appear sufficient to significantly reduce the risk of depression, while three are linked to lower levels of anxiety. Interestingly, beyond those thresholds, improvements in well-being become relatively small or even negligible. This does not mean that having five or ten close friends is harmful. Rather, the findings suggest that, for our well-being, the quality of our relationships matters far more than their quantity — even if we are talking about just one person. As Winnie-the-Pooh once put it, “A day without a friend is like a pot without a single drop of honey left inside”.