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Decade-Long Study Links High Adolescent Social Media Use to Increased Mental Health Risks

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Social Media and Adolescent Mental Health: A Decade of Evidence

A comprehensive analysis of multiple studies reveals an association between high social media use in adolescents and increased risks of mental health issues, with the strongest effects observed in early adolescence. Findings from several Australian studies present a complex picture, with some research supporting age-based restrictions while others question the effectiveness of blanket bans.

Major Longitudinal Study Findings

A study published in the Medical Journal of Australia examined data from nearly 1,200 Melbourne students tracked from ages 9 to 19 over a ten-year period. The research, led by the Murdoch Children's Research Institute (MCRI) and Deakin University, collected annual data from 2015 to 2021.

Adolescents who reported using social media for two or more hours per day showed a higher risk of developing mental health problems one year later compared to those who used it for less than one hour per day. The association was strongest for both girls and boys aged 12-13 years.

Specific Findings for the 12-13 Age Group

  • For every 100 girls using social media for at least two hours daily, there were approximately 11 additional cases of high depressive symptoms and poorer wellbeing.
  • For every 100 boys, there were approximately 7 additional cases.
  • Boys in this age group exhibited a slightly higher increase in risk of self-harming behaviors than girls.

The study controlled for individual and family factors, but researchers noted the findings do not prove causation. The study relied on self-reported usage data and did not differentiate between platforms or types of engagement.

Researcher Statements

"The risk peak in early adolescence may be linked to puberty, increased sensitivity to peer approval, and ongoing brain development in emotion regulation."
— Dr. Nandi Vijayakumar (Deakin University), Lead Researcher

"The findings support a balanced approach to social media policies, noting that many adolescents report positive experiences with social media."
— Professor Susan Sawyer (Murdoch Children's Research Institute)

Second Study on Moderate vs. Extreme Use

A separate study from the University of Adelaide tracked over 100,000 students from Year 4 to Year 12 over three years. This research found that the relationship between social media use and wellbeing was not linear and varied by age and gender.

Key Findings from This Study

  • Moderate social media use (more than zero but less than 12.5 hours per week after school) was associated with the best wellbeing outcomes.
  • Both heavy use (12.5 hours or more per week) and no use were linked to poorer outcomes.
  • For girls in years 4 to 6, non-users reported the highest wellbeing.
  • For boys from mid-adolescence onward, those who did not use social media were increasingly likely to report poorer outcomes.

"The findings challenge one-size-fits-all rules and blanket bans, suggesting that both excessive restriction and excessive use can be problematic depending on age and sex."
— Dr. Ben Singh, Lead Author

Context of Australian Social Media Restrictions

Australia introduced a social media access restriction for individuals under 16 years of age in December 2024.

Implementation Data

  • Federal government data from March 2026 indicated approximately 70% of children who held accounts before the ban continued using them.
  • A Western Sydney University study (May 2026) and a BMJ study (June 2026) reported similar rates.
  • A BMJ study (n=408) found that 86% of surveyed teens used a banned platform in the previous week.
  • 68% of 14-15 year olds accessed social media through their own accounts without age verification.

The eSafety Commissioner compared the ban to "fencing the ocean" and noted age verification techniques remain ineffective. Flinders University academic Dr. Matthew Stevens called it "a failure of implementation."

Unintended Consequences

A Western Sydney University study found that teens affected by the ban reported a 51% drop in news consumption. Mental health organizations including Black Dog and Beyond Blue argued the ban could cut young people off from support networks.

Expert Perspectives on Policy and Evidence

"The evidence is insufficient to inform policy decisions and the ban might be more harmful than helpful."
— Professor Jo Robinson (Orygen Policy Centre)

More than 140 researchers signed an open letter before the ban, describing it as "too blunt an instrument."

"A blanket ban is one tool for a complex issue. Mixed reactions among teenagers to the social media ban included some feeling relief and others feeling frustrated."
— Caroline Thain (headspace, Manager of Clinical Advice and Governance)

Recommendations and Ongoing Research

Researchers from the MCRI study suggest early adolescence is a critical window for intervention, including age-appropriate limits, educational programs, and parental guidance. The study recommends continued supports for older adolescents, platform accountability, and digital literacy education.

The Connected Minds Study is currently monitoring the impact of Australia's social media age restrictions on teenagers' phone use, screen time, and mental health.