The Cost of the Feed.
What the evidence shows about social media, children, and the generation we are building. Government surveillance, peer-reviewed research, internal corporate documents, and active litigation — gathered, sourced, and unsparing.
Around 2012, the prevalence of mental health disorders among American adolescents began to rise sharply after roughly a decade of stability. The rise has continued. The break is most pronounced in girls, but extends to boys. It appears in the United States, Canada, the United Kingdom, the Nordic countries, Australia, and across most of the developed world. It tracks the rollout and saturation of smartphones and the ascendancy of algorithmically-curated social media feeds with unsettling precision.
Causation is debated. Correlation is not. The U.S. Surgeon General has issued formal advisories. Forty-two state attorneys general have sued Meta. Internal company research, made public through whistleblower disclosures, shows that platforms have known about specific harms — to body image, to sleep, to suicidal ideation — and weighed them against engagement metrics.
The receipts.
Six numbers from the dossier. Each is a thread you can pull, sourced inline and in the index. None of them are estimates from the press; all are from primary surveillance, peer review, internal corporate research, or court filings.
“We make body image issues worse for one in three teen girls.”
From the Facebook Files, leaked by Frances Haugen
Read it in pieces, or all at once.
Roughly an hour’s reading. Every claim sourced. Every figure traceable to its primary document. Begin anywhere.
The State of the Crisis
Mental health data, 2010–present
Saturation
How much, how young, how often
The 2012 Inflection
When the curves bent
Mechanisms of Harm
How the damage is done
Sleep and Cognition
What the screen takes from the developing brain
Body Image and the Algorithm
Comparison, eating disorders, amplification
Predation
Sextortion, grooming, exploitation at scale
The Decline of In-Person Life
Loneliness, displacement, withdrawal
The Industry Knew
Internal evidence and the Facebook Files
The Legal Response
Lawsuits, statutes, regulation
Phone-Free Schools
A natural experiment
Stories
What the data feels like
Counter-Arguments
What the skeptics say
International Comparisons
Australia, the EU, the global response
What the Evidence Says to Do
Interventions and their support
What this work answers.
Each answer below is drawn directly from the dossier, with the relevant section linked for the full evidence. No spin, no listicle.
Is social media causing the teen mental health crisis?
Strict causation has not been proven to the standard of, say, smoking and lung cancer. But the correlation is robust, the timing is precise (the curves bent around 2012, when smartphones reached saturation), the geographic pattern is uniform across the developed world, and natural experiments — notably the Norwegian phone-ban study — point in the same direction. The U.S. Surgeon General, the WHO, the AAP, the APA, and a bipartisan coalition of 42 state attorneys general have converged on concern.
See Section XIII — Counter-Arguments for the full back-and-forth.
When did teen mental health start declining, and why is 2012 important?
From the early 1990s through approximately 2010, indicators of adolescent mental health were broadly stable. Beginning 2010–2012, rates of depression, anxiety, self-harm, and suicide began rising sharply. Between 2010 and 2015, U.S. teens reporting classic depressive symptoms rose by approximately one-third; suicide attempts rose by approximately 23%. Smartphones reached ~50% of U.S. adults in late 2012; by 2015, more than 90% of U.S. teenagers owned one.
What did Meta know about Instagram’s effects on teen girls?
Internal Meta research, made public through the 2021 Frances Haugen disclosures, found that 32% of teen girls said when they felt bad about their bodies, Instagram made them feel worse; 13.5% of British teen girls who reported suicidal thoughts attributed worsening to Instagram specifically; and 17% of teen girls said Instagram contributed to worsening of an eating disorder. An internal Meta slide framed it: “We make body image issues worse for one in three teen girls.”
Do phone-free schools actually work?
The strongest evidence is the 2024 Abrahamsson study from the Norwegian Institute for Public Health. Schools with strict bans (physical phone handover) saw girls’ specialist mental-health visits decline 60% and GP mental-health visits decline 29%. Girls’ GPA on externally graded math exams rose by approximately 0.22 standard deviations — four to twenty times larger than the typical effect of class-size reduction. As of 2026, 26 U.S. states had enacted phone-free school laws.
What does the evidence say parents should do?
Four interventions have the strongest empirical support: delay the smartphone until at least high school; delay social media (the de facto industry minimum age of 13 is widely regarded as too low); phones out of bedrooms overnight; and restore unstructured, in-person play.
Did Australia ban social media for kids?
Yes. Australia’s Online Safety Amendment (Social Media Minimum Age) Act 2024 prohibits persons under 16 from holding accounts on designated social media platforms. It took effect December 10, 2025. Penalties for non-compliance reach AUD 49.5 million per violation. Enforcement falls on the platforms.
Read the full dossier.
The complete document, in one continuous read, with citations inline and a sticky chapter index for navigation.
Open the document→Adolescents and young adults are in the midst of a mental health crisis, particularly among girls and young women. The rise of digital media may have played a role.
— Twenge, Psychiatric Research and Clinical Practice, 2022