Jonathan Haidt | Compiled from 797 notes on WeChat Read
I. A Book That Makes You Unable to Sit Still
Reading Jonathan Haidt’s The Anxious Generation, it’s hard to stay calm. As the father of children, I marked 797 notes in WeChat Read, with a dozen or so “thoughts posted” scattered among them. This almost obsessive way of reading may itself be a manifestation of anxiety: I want too badly to know what kind of world my children will face when they reach adolescence. And whether the way I’m raising them right now is building a moat around them, or — without meaning to — tearing down the city wall with my own hands.
Haidt’s answer is cold and direct: the core reason children born after 1995 became “the anxious generation” lies in the joint action of two parental trends — overprotection in the real world and underprotection in the virtual one. He calls this turning point “The Great Rewiring”: between 2010 and 2015, the combination of the smartphone and social media completely rewrote the childhood pattern of a generation.
This isn’t a book against technology. Haidt himself doesn’t deny the convenience of digital tools; he even admits that social networks are a “powerful instrument” for adult users. But he points out incisively that these platforms were never designed with children’s brains in mind. When a 13-year-old girl’s prefrontal cortex is still immature, yet she faces a “variable-ratio reinforcement schedule” precisely engineered through behavioral psychology — those randomly dropping red dots, likes and comments — there is no essential difference in neural mechanism between her and a gambler in front of a slot machine.
II. The Lost Childhood: From “Play-Based” to “Phone-Based”
Haidt takes the late 1980s as the starting point of the transition from a “play-based childhood” to a “phone-based childhood.” The concept is precise to the point of heartache.
What is a play-based childhood? Not organized extracurricular classes, not adult-designed Lego courses, but a group of mixed-age kids running wild outdoors, climbing trees, playing with fire, wrestling, making their own rules and resolving their own conflicts. Ideal play is a group of children handling risk and relationships autonomously, without adult supervision. Citing anthropological research, Haidt points out that this kind of free play is the learning method mammal brains love best — large amounts of repeated practice, paired with clear positive and negative feedback, at extremely low cost of risk. Slight scrapes and tears aren’t the problem; they are the teaching aids of growth.
But over the past thirty years this childhood has disappeared. Parents, out of good intentions, painted the world as full of danger: kidnappers, pedophiles, car accidents, school bullying… The current of safetyism swept through the field of parenting. I remember one detail from the book: American elementary schools don’t even allow children to play tag freely — it must be done under adult supervision, otherwise “the consequences are unthinkable.” This reminds me of last year in Hefei, when a classmate who works as a primary school teacher told me that during breaks at their school, the children generally don’t leave the classroom — for fear something will go wrong. Haidt’s “experience blockers,” in the name of love, are systematically stripping children of the chance to come into contact with the real world.
At the same time, the gates of the virtual world stand wide open to children. The loophole in the 1998 US Children’s Online Privacy Protection Act allowed children over 13 to “independently” agree to a platform’s terms of service — and all they had to do was tick a fake birthday. And so a paradox emerged: parents fight desperately to kill off every kind of risk in the real world, restricting children’s free movement, and yet in the virtual world they grant children complete autonomy.
My five-year-old son is a natural mixer. On a high-speed train ride of over ten hours he’ll go and find the nearby children to play with on his own initiative, playing from boarding to arrival. When I came to this note, I wrote an annotation beside it: “Human children are born loving to form connections with others.” This is an instinct granted by evolution. But Haidt reminds us that the “connection” manufactured by social media is an exquisite counterfeit — it is disembodied, non-real-time, one-to-many, and can be exited at any moment. Children learned to substitute emoji for micro-expressions and learned to measure their self-worth in like counts, yet never truly acquired the social skills our ancestors spent millions of years evolving.
III. The Four Great Harms: Social Deprivation, Sleep Deprivation, Attention Fragmentation and Addiction
Haidt sums up the harms of the phone-based childhood at four levels, each backed by solid data.
1. Social Deprivation: The Most “Connected” Generation, the Loneliest Generation
Ironically, Gen Z is the most tightly “connected” generation in history, and also the loneliest. Social media increased the number of friends but lowered the quality and safety of relationships. Citing research, Haidt points out that the happiest girl “isn’t necessarily the one with the most friends, but her friends are certainly the most sincere and most considerate. Such a friend — even just one is enough.”
But social media is precisely what destroys this kind of deep connection. When a 13-year-old girl lies in bed scrolling Instagram, looking at hundreds or thousands of retouched perfect faces, it’s as if a “social meter” in her brain is sounding a frantic alarm — the anxiety compels her to keep adjusting her behavior to win approval. This mechanism hits girls especially hard, because they place more weight on “communal” relationships, and the design logic of social media is precisely an amplifier of relational aggression: spreading rumors, sowing discord, anonymous humiliation. Bullied girls have nowhere to escape, because the smartphone follows them like a shadow — even into the bathroom and under the covers.
2. Sleep Deprivation: The Stolen Night
Teenagers’ sleep is already insufficient, and smartphones make matters worse. Blue light misleads the brain into thinking “it’s morning now,” suppressing melatonin secretion; social media’s infinite feed turns “one more post” into “two more hours.” The CEO of Netflix even admitted: “Our competitor is sleep.” Insufficient sleep is directly linked to depression, anxiety, irritability and cognitive deficits. Haidt’s data is shocking: after entering the second decade of the 21st century, the prevalence of adolescent depression climbed steeply, and sleep deprivation is a major driver.
3. Attention Fragmentation: Vonnegut’s Prophecy Comes True
In 1961 Kurt Vonnegut imagined an extremely egalitarian future in a novel: people with too-high IQs must wear interference headphones that emit noise every 20 seconds to interrupt their thinking. Sixty years later, this absurd premise has become Gen Z’s daily life. Haidt’s MBA students receive about 11 phone notifications per hour on average — equivalent to one every 5 minutes. The brain does not support genuine multitasking; every switch wastes cognitive resources. For teenagers whose prefrontal cortex is still immature, this fragmentation not only lowers learning efficiency but fundamentally obstructs the cultivation of their “executive capacity.”
4. Addiction: Trained Rats
This is the cruellest part. The designers of social media and video games are experts in behavioral psychology, and they have moved the Skinner box into children’s pockets. The “variable-ratio reinforcement schedule” — the randomness and unpredictability of the reward — is one of the most powerful ways of controlling animal behavior. The infinite feed gives no signal to “stop,” and the more you invest (time, emotion, social relationships), the harder it is to pull away. Haidt discloses that internal Facebook documents show Instagram told 32% of its teen girl users that when they felt bad about their bodies, the platform made them feel worse.
IV. Boys and Girls: Two Different Falls
Haidt doesn’t speak of “children” in the abstract but carefully distinguishes the differences between the sexes.
Girls mainly show internalizing disorders: depression, anxiety, eating disorders, self-harm. They are trapped in the cage of appearance comparison, told repeatedly by Instagram’s filters and TikTok’s algorithm: you aren’t good enough, you could be thinner, more beautiful, more perfect. “Socially prescribed perfectionism” exploded after 2010, and the social comparison girls encounter on social media is of a magnitude their ancestors might not have met in a whole lifetime. Even more frightening is the contagiousness of emotion: girls are more inclined to share and resonate with each other’s feelings, which lets depression and anxiety spread through social networks like a virus.
Boys, meanwhile, went down another road: externalizing disorders turning into inward withdrawal. They no longer binge-drink, street-race and fight like their fathers’ generation, but this isn’t because they’ve “become more sensible” — it’s because they are withdrawing from the real world. Massively multiplayer online games provide boys with virtual adventure and brotherhood, but also let them escape real risk and real growth. Japan has the “hikikomori,” America has young people “living off their parents”; they found “freedom” in their bedrooms — no need to deal with inner anxiety, no need to face the uncertainty of the real world. But the price of this “freedom” is bone-deep loneliness: 28% of young men say they have no one to consult when making important personal decisions.
When I read “feeling very lonely, unable to see the meaning of life, unable to find a direction for the future,” I annotated beside it: “Actually college students and adults today are the same. Capital greedily concentrates wealth in the hands of 20% of people, and most people actually live quite ordinary lives.” Haidt is talking about teenagers, but this book’s cautionary significance clearly goes beyond that.
V. The Deep-Rooted Lesion: Self-Exploitation Under the Achievement Society
If Haidt explains from the angles of sociology and psychology how “the anxious generation” came to be, then Byung-Chul Han’s The Burnout Society, which kept coming to mind as I read, provides another key: why is this generation’s inner life so fragile that it breaks at a touch under the impact of the smartphone?
I once wrote this annotation in my notes:
The shift from the earlier “disciplinary society of negation” to the “achievement society of affirmation” is the key that distinguishes traditional hardship from modern psychological internal friction. Earlier societies were centered on prohibitions, bans and external oppression: don’t steal, don’t slack off. Suffering came from outside control, and when frustrated you could attribute failure to the system, the environment, other people. But the achievement society no longer has hard prohibitions; in their place is the promise of unlimited potential: you can do anything, as long as you work hard enough. In study, passing isn’t enough — you need an elite school. At work, completing your duties isn’t enough — you need promotion and a raise. Physique, income, connections: all must keep iterating. Failure is no longer external obstruction but a deficiency in your own ability — the conflict shifts from the opposition between person and society to the internal friction between person and self.
This forms a cruel contrast with the “laws of brain development” Haidt mentions: the adolescent reward system (the nucleus accumbens) is already mature and craves positive feedback, but the prefrontal cortex isn’t fully developed until around 25, and it is what handles rational loss-cutting and accepting limits. The achievement society exploits exactly this time gap — it keeps raising the stakes along the grain of instinctive desire while leaving the prefrontal cortex no room to breathe. And so workplace anxiety at 35, credential-driven internal friction and tiger parenting all become concrete expressions of the hidden shackle of “you must be excellent continuously.” We appear to have the right of free choice, when in fact we are trapped in the paradox of “becoming our own slave masters.”
From this perspective, smartphones and social media are destructive not only because their design is inherently addictive, but because they have become the achievement society’s most perfect amplifier: the algorithm pushes “better” specimens nonstop, like counts quantify the individual’s “achievements,” and the infinitely scrolling flood of information eliminates the possibility of “stopping.” When a child’s brain is steeped continuously in this logic during the sensitive period (ages 9–15), what they learn isn’t “how to become a whole person” but “how to become a performance subject who is forever not good enough.”
Haidt says that life dominated by the phone has caused “spiritual degradation” in everyone. He lists six weakened spiritual practices: the collective sense of the sacred, embodied expression and experience, stillness and focus, self-transcendence, slow anger and quick forgiveness, and awe of nature. When everything can be clicked, swiped and quantified, humanity loses the possibility of elevation along the “vertical dimension” — “There is a hole in everyone’s heart that only God can fill. If we cannot fill it with the noble and the great, modern society will soon stuff it full of junk.”
VI. What Can We Do?
Haidt offers four core recommendations in the book:
- No smartphone before high school (only a basic phone before age 14)
- No social media accounts before age 16
- Phone-free schools
- Give children ample free play time and autonomy
These recommendations may seem radical in America, but in China the first and third have already partly become reality. Since 2021, China has banned bringing personal phones onto primary and secondary school campuses — something Haidt praised in his preface to the Chinese edition. This is progress at the institutional level. But Haidt also reminds us that banning phones is only the first step; without the return of the play-based childhood, children will still seek in the virtual world what has been taken from them in reality.
More fundamental change requires social consensus. Haidt shares a key finding: when parents act alone in trying to stop their child from using a smartphone, they often lose, blackmailed by the child with threats of “isolation.” But when a group of parents work together — for example a collective agreement to “delay the smartphone until 14” — children then have a healthy peer environment and no longer feel like outsiders. As Haidt put it: “These changes were all driven by mothers.” In Australia, some communities have collectively raised the age for registering on social media to 16.
For me personally, the greatest impact of this book wasn’t panic but clarity. I signed my son up for basketball classes — not for the sake of a special talent, but so he can experience that embodied socializing of being drenched in sweat, high-fiving teammates and learning to win and lose in a game. I hope the instinct that makes him seek out strange children to play with on a high-speed train won’t be sealed away behind a screen a few years from now. I also hope I can be a father who is “present” — not physically sitting beside him, but spiritually not fragmented by my phone.
VII. Give Childhood Back to Children
In his conclusion Haidt writes: “It’s time to call off the mission to Mars — let’s bring our children back home to Earth!” That sentence stayed with me for a long time. Over the past decade-plus we really have been conducting a grand experiment: sending a generation of children off to “grow up” in the virtual world, believing that was a more civilized, more efficient path of evolution. But the results are already showing — the incidence of anxiety, depression and self-harm is soaring simultaneously in multiple countries, with girls taking the first hit and boys quietly retreating.
The phone-based childhood has an opportunity cost. When a child spends 6–8 hours a day staring at a screen, what he loses isn’t time but the cultivation of antifragility, the building of deep relationships, the experience of rites of passage, and awe of nature. In the virtual world he learned to perform but not to live; he accumulated “friends” but never learned to love and be loved.
As parents we may be unable to reverse the wave of technology, but we can choose: let go moderately in the real world, set limits firmly in the virtual one, and give children a childhood in which they are allowed to make mistakes, allowed to be bored, and allowed to roll around in the mud.
Because in the end, children don’t need to become “internet celebrities” in the virtual world. What they need is to become whole people in the real one.
Postscript: After finishing these notes, I walked into the living room. My five-year-old son was building blocks on the floor, and my four-year-old daughter had arranged her plush toys in a circle for a “meeting.” Sunlight slanted in through the window and dust danced in the beam. I quietly turned off the notifications on the phone in my pocket. In moments like this, I don’t want to be disturbed by any algorithm.
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