Summary
Chapter 5—The Four Foundational Harms: Social Deprivation, Sleep Deprivation, Attention Fragmentation, and Addiction
In 1911, American psychologists Edward Thorndike conducted a study in which hungry cats had to solve puzzles in order to access food. Haidt applies Thorndike's description that "animal learning is 'the wearing smooth of a path in the brain, not the decisions of a rational consciousness'" to excessive device usage. Early versions of the iPhone were not designed to be addictive. However, the advent of third-party apps downloaded onto mobile devices drastically increased the time people spent online. Haidt dates the beginning of the phone-based childhood to the early 2010s. He discusses the costs in time, energy, and development. Phone use also degrades the quality of time spent with others because of the way smartphones capture our attention.
The average teenager now gets around seven hours of sleep per night, much less than the nine hours they need, which exacerbates mental health struggles. In addition, the presence of smartphones distracts children and adolescents in particular because the frontal cortex does not finish developing until later. This part of the brain is responsible for higher-order cognitive functions such as decision-making, planning, and impulse control.
Chapter 6—Why Social Media Harms Girls More Than Boys
Haidt begins Chapter 6 with the story of an 11-year-old girl who circumvented parental restrictions to open various Instagram accounts. Over time, the app's algorithm exposed her to pro-anorexia content. She struggled with mental health and eating disorders for the rest of her adolescence. Larger trends reflect the fact that girls have suffered more as a result of social media: around 2013, psychiatric wards in Anglophone countries began to fill disproportionately with girls. According to Haidt, girls who self-report that they spend five or more hours per weekday on social media are three times more likely to be depressed than those who report no social media time. Furthermore, social media harms even those who do not use it because it degrades the quality of in-person communication.
Societal norms for appearance impose more critical standards on girls and women than on boys and men. Instagram filters create even more unrealistic standards and socially prescribed perfectionism. Rumors, internet trolling, and reputational destruction fuel public shaming and bullying. The researcher Leslie Boss found that adolescent girls are the most susceptible to sociogenic epidemics. TikTok increased the prevalence of 'mass social media-induced illness' in which the symptoms of certain rare disorders, illnesses, dysphorias, and diseases spread socially. Online predation and exploitation also targets girls more than boys.
Chapter 7—What is Happening to Boys?
Adolescent rates of depression and anxiety have also risen for boys. Haidt claims that the rise of safetyism in the late 20th century "hit boys harder than girls, because boys engage in more rough-and-tumble play and more risky play." The impacts can be devastating, as shown in the existence of Japanese hikikomori, young men who live like hermits to escape the pressures and expectations for high achievement. This relates to the modern phenomenon of young people "failing to launch," meaning that they struggle to transition from dependence to independent adulthood. Research shows that young men are more likely to fail to launch than young women.
Haidt suggests that Gen Z is engaging in less risky behaviors than previous generations (such as reckless driving, getting into fights, or unplanned pregnancies) because they spend far less time in the physical world. The fact that hardcore porn has become far more accessible also negatively affects boys' and young men's romantic and sexual relationships. Haidt uses Émile Durkheim's concept of anomie (normlessness) to describe how an absence of stable and widely shared rules contributes to feeling lost and anxious.
Chapter 8—Spiritual Elevation and Degradation
Chapter 8 comes from a personal rather than a scientific framework, as the author argues that phone-based lifestyles degrade spirituality. Haidt describes the dimensions of social space: the X axis represents closeness, the Y axis hierarchy, and the Z axis divinity. This last axis refers to cultural distinctions between virtuous actions that bring one upward (closer to God) versus base actions that bring one downward (toward an anti-divinity). In certain places and times, people turned not to God but to something they perceived as sacred, pure, and elevating. Thomas Jefferson wrote in 1771 that great literature elevates the reader's sentiments and inspires better behavior.
When rituals move online (as they did during the COVID-19 pandemic), the lack of synchronous physical movement contributed to social detachment. Virtual reality will never approach the experience of sharing a meal with others. The researcher and professor of psychology Dacher Keltner identified the eight most common categories of awe, a powerful antidote to self-absorption. These are moral beauty, collective effervescence, nature, music, visual design, spiritual and religious awe, life and death, and epiphanies. Spending excessive amounts of time online exposes us to content that pulls us downward on the divinity dimension.
Analysis
The very language that social media apps rely on creates a counterfeit version of social connection. Specifically, the words "networking," "followers," "friends," and "likes" falsely gesture toward the emotional investment, vulnerability, and presence needed to form authentic bonds. Although genuine connection can happen online, many critics of social media (including Haidt) point out that excessive reliance on social media harms real-life relationships. Staying "connected" through a digital pursuit simply does not address human social needs. A 2023 study published in Nature "underscore[s] the importance of face-to-face communication for mental health" (Stieger et al.). Particularly for children, internet overuse interferes with crucial brain development and social-emotional skills.
Haidt discusses how advertisers and social media entrepreneurs employ behaviorist techniques to hook people's attention. In this attention economy, companies compete to capture and retain people's focus by leveraging the principles of operant conditioning. These include rewards and punishments that stimulate the release of dopamine (a crucial neurotransmitter that plays a variety of roles, including motivation, pleasure, and attention). As Haidt writes in this book, children are the most vulnerable to this manipulation. The impacts range from decreased attention spans to abuse and exploitation. Multiple allegations have reached the courts concerning the addictive nature of social media platforms. In 2025, this culminated in a Social Media Addiction Lawsuit alleging that "companies intentionally designed their platforms to be addictive to children and teens without warning of the mental and physical harm that would follow (Bergman).
The notion of social contagion appears in Chapter 6 when Haidt writes about research conducted by the sociologist Nicholas Christakis and the political scientist James Fowler. Social contagion is the notion that emotions, behaviors, and even health outcomes can spread through social networks. In addition, humans exhibit a strong negativity bias, meaning that negative emotions are more contagious than positive ones. This has an evolutionary origin since prioritizing responses to threats facilitates self-preservation.
Haidt has been criticized for making blanket statements that incite a moral panic. For instance, in an article published in The Guardian, the psychologist Candice Odgers accuses Haidt of drawing sweeping conclusions from unsettled science. However, in The Anxious Generation, Haidt does acknowledge the nuance and complexities of certain issues. For example, in his discussion of how pornography impacts boys and young men, he writes, "I'm not saying that all pornography is harmful; I’m saying that immersing boys in an infinite playlist of hardcore porn videos during the sensitive period in which the sexual centers of their brains are being rewired is maybe not so good for their sexual and romantic development, or for their future partners" (Chapter 7). This concession avoids making an absolute statement because Haidt narrows the context to focus on adolescence for boys.
Despite not being religious himself, Haidt emphasizes the importance of awe, moral elevation, and self-transcendence. In his book The Happiness Hypothesis, he describes his transformation from being an ardent atheist in his younger years to having a more open outlook on the function of religion and spirituality in human life. He continues with this line of thought in The Anxious Generation when he writes about how spiritual experiences address the pitfalls of having an egocentric perspective. By also acknowledging the times when "religion has...motivated people to be cruel, racist, and genocidal," he again treats a complex topic with nuance.
