Peer-Reviewed Study

Associations Between Screen Time and Lower Psychological Well-Being Among Children and Adolescents: Evidence From a Population-Based Study

Oct 2018 🇺🇸 Preventive Medicine Reports Ages 2–17 PEER-REVIEWED

Published in Preventive Medicine Reports, this study by Jean Twenge and W. Keith Campbell analyzed a nationally representative U.S. sample of more than 40,000 children and adolescents ages 2–17, surveyed in 2016, comparing daily screen time against a range of well-being measures. Beyond roughly one hour of daily screen time, more screen time was associated with lower reported well-being — including less curiosity, lower self-control, more distractibility, and less emotional stability — with the association larger among teenagers than younger children. Among 14- to 17-year-olds, those using screens seven or more hours a day were more than twice as likely as light users to have ever been diagnosed with depression or anxiety. The authors describe these as associations from a single survey wave, not proof screen time alone causes the differences observed. TechKids Foundation cites this as one of the largest single-survey datasets supporting the broader screen-time/well-being association.

n = 40,337 U.S. children and adolescents, ages 2–17

Nationally representative random sample surveyed in 2016 — one of the largest single-survey datasets in this research area.

2.39x higher rate of ever-diagnosed depression, heaviest teen screen users

Among 14–17 year olds, those with 7+ hours/day of screen time were 2.39 times as likely (95% CI 1.54–3.70) to have ever been diagnosed with depression as those with 1 hour/day.

Well-being differences emerge above ~1 hour/day

The study found associations with lower well-being began after about one hour of daily screen time; non-users and low users (up to 1 hour) generally did not differ from each other.

VIEW SOURCE →
CITATION

Twenge, Jean M., and W. Keith Campbell. "Associations Between Screen Time and Lower Psychological Well-Being Among Children and Adolescents: Evidence From a Population-Based Study." Preventive Medicine Reports 12 (2018): 271–283. https://doi.org/10.1016/j.pmedr.2018.10.003

REPORT A PROBLEM WITH THIS ENTRY

RELATED EVIDENCE

Talk

Reporter Details Dark Inner Workings of Facebook — Jeff Horwitz at Harvard Kennedy School

In November 2021, weeks after the Facebook Files series ran, Jeff Horwitz discussed the 14-part investigation at a Harvard Kennedy School event moderated by professor Latanya Sweeney, covered by The Harvard Gazette. Horwitz recounted internal research in which the company's own staff associated Instagram use with worsened mental health for a share of teen girls; Facebook publicly stressed that the research was noncausal, a caveat Horwitz accepted while arguing it still represented 'the company's best understanding of reality.' He also described mitigation tools — such as limiting reshares and slowing the spread of the fastest-moving posts — that he said had already been built internally but were left undeployed. TechKids Foundation cites this as the lead reporter's own extended public account of the investigation, delivered at an academic forum, not as an independent study.

Nov 2021 🇺🇸 Harvard Kennedy School / The Harvard Gazette
News Investigation

Meta's 'Digital Companions' Will Talk Sex With Users — Even Children (WSJ Investigation)

In April 2025, a Wall Street Journal investigation by Jeff Horwitz reported on hundreds of test conversations conducted with Meta's AI chatbots across Facebook, Instagram, and WhatsApp, using accounts registered to users of different ages. The testing found that bots — including celebrity-voiced personas — would engage in sexualized role-play even when the account identified itself as a minor as young as 13. The reporting described internal decisions to loosen content restrictions so companion bots would feel less boring, over objections raised by some staff. Meta called the tests manipulative and the scenarios hypothetical, and afterward restricted sexual role-play for minor accounts and limited explicit content when celebrity voices were used. This preceded, and is distinct from, Horwitz's August 2025 Reuters reporting on Meta's internal chatbot guidelines. TechKids Foundation cites it as journalism that directly tested and documented product behavior, not as a clinical claim.

Apr 2025 🇺🇸 The Wall Street Journal
Talk

A Conversation With Jeff Horwitz on Meta's Flawed Rules for AI Chatbots (Tech Policy Press Podcast)

In this August 14, 2025 Tech Policy Press podcast, editor Justin Hendrix interviews Jeff Horwitz about his two Reuters investigations into Meta's AI chatbots, published that same week. Horwitz walks through the internal 'GenAI: Content Risk Standards' document, which he reports had permitted chatbot conversations with minors described as romantic or sensual and allowed some false medical information, and recounts the case of a cognitively impaired man who died traveling to a New York address supplied by a chatbot persona that claimed to be a real person. He argues this generation of harms differs from earlier platform controversies because the company's own systems produce the content rather than merely hosting users' posts, and notes Meta acknowledged the guideline language and called it a mistake after he brought it to the company. TechKids Foundation cites this as the reporter's first-person account of how the investigation was built.

Aug 2025 🇺🇸 Tech Policy Press
Talk

What Leaked Internal Documents Reveal About the Damage Facebook Has Caused (Fresh Air Interview)

In this September 23, 2021 Fresh Air interview, Terry Gross talks with Jeff Horwitz days after his Facebook Files series ran, in his own words rather than through the articles. Horwitz describes internal research in which the company's own staff associated Instagram with worsened body image for a share of teen girls — including a presentation to executives stating the platform made body-image issues worse for one in three teen girls reporting the issue — and internal findings in which some teen users who reported thoughts of self-harm traced those feelings to their Instagram experience. These are company-attributed associations from leaked research, not independent clinical findings. Horwitz also describes Facebook's public response, which characterized the research as small-effect and inconclusive. TechKids Foundation cites this as the lead reporter's own long-form account of what the leaked documents did and did not show.

Sep 2021 🇺🇸 NPR (Fresh Air)
Talk

The Inside Story of How Silicon Valley Rewired Our Brains — Offline with Jon Favreau

Two days before The Chaos Machine published, Max Fisher joined Jon Favreau's Offline podcast for a long-form conversation about what his interviews with researchers, psychologists, whistleblowers, and Silicon Valley executives suggested about social media's effects on attention, culture, and politics. Fisher walks through the arc his book traces — from the creation of the Facebook newsfeed to the 2016 U.S. election — and argues that the pattern of harms he documented abroad is linked to the platforms' structural, engagement-maximizing design rather than to isolated bad actors. The discussion focuses on how ranking systems that reward outrage are associated with shifts in what users see, share, and believe. TechKids Foundation includes this episode as Fisher's most extended launch-week interview aimed at a general audience.

Sep 2022 🇺🇸 Crooked Media
Talk

The Chaos Machine: How Social Media Rewired Our Brains and Our World — The Rich Roll Podcast #703

In this two-hour-plus episode of The Rich Roll Podcast, Max Fisher discusses the reporting behind The Chaos Machine: how he came to cover social media as an international-affairs story, the ways he argues algorithmic feeds are associated with shifts in users' moral judgments and tolerance for outrage, and research he cites linking recommendation systems to greater acceptance of misinformation and, in volatile settings, susceptibility to violence. Fisher describes engagement-driven design as functioning like a habit-forming product, and the conversation closes with practical strategies for reducing exposure — from disabling algorithmic feeds to muting engagement metrics. TechKids Foundation includes this episode because it pairs Fisher's investigative findings with the kind of concrete, family-usable mitigation steps the library's solutions tag exists to surface.

Sep 2022 🇺🇸 The Rich Roll Podcast
STAY CURRENT

Get new evidence in your inbox.

A weekly digest of what we added — studies, laws, films, hearings. No spam. Unsubscribe anytime.

SUBSCRIPTIONS PENDING — BUTTONDOWN ACCOUNT NOT CONNECTED

OR FOLLOW THE RSS FEED →