Authored by Jerry Zhu via The Epoch Times,

An Australian-led study has found children and teenagers who spend more time on social media are more likely to experience depression, self-harm, substance use, and lower achievement later in life.

Published in JAMA Pediatrics, the systematic review examined data from 153 studies consisting of over 350,000 children and adolescents aged between 2 and 19 years, for up to two decades.

“The strongest pattern we saw was between social media use and later problematic media use, suggesting early patterns of engagement may become more entrenched and difficult to manage over time,” said Sam Teague, a senior research fellow at James Cook University.

The study focused on longitudinal research, which follows participants over time and offers stronger insight into how behaviours and outcomes develop.

Teague said previous research in the field often relied on snapshots collected at a single point in time, making it harder to determine whether social media use preceded negative outcomes.

However, she stressed the findings do not prove social media causes harm.

Instead, the results show consistent links between higher use and a range of developmental outcomes, including cognitive, social-emotional, physical health, and motor development.

Amy Orben, a professor at the Medical Research Council Cognition and Brain Sciences Unit at the University of Cambridge, said the relationship may be more complex.

“It may be that children who are already struggling spend more time on social media, rather than social media being the cause of their difficulties,” Orben said.

“Similarly, some personality traits or life circumstances might make certain children both more likely to use social media heavily and more likely to experience poorer developmental outcomes.”

Adolescents Identified as Most Vulnerable

Teague said one possible explanation is that time spent online may displace activities linked to better mental health.

“Time spent on digital media [could] displace time that would otherwise be spent on things that are linked to improved mental health, like exercise and connecting with family and peers in real life,” Teague told The Epoch Times in an email.

She also contrasted the interactive nature of social media with traditional media.

“Unique to digital media over traditional media, is its interactive nature, whereby children and teens are encouraged to keep engaging with content through addictive features like auto-play and auto-scroll,” she said.

Adolescents in particular were identified as more vulnerable to the effects of social media.

“Early adolescence is when identity formation and peer relationships become key developmental systems for young people,” she said.

She added that social media can magnify these pressures through constant external feedback and large social comparison.

“Action is needed at the policy and platform level most to make our online environments, that are designed largely for adults, appropriate for children,” she said.

“Addictive design features particularly need attention, like auto-play and auto-scroll, as well as exposure to harmful content.”

Social Media Companies Taken to Court Over Claims of Addictive Design

The new research comes as plaintiffs won a landmark social media addiction case in the United States.

The civil trial in Los Angeles centres on a 20-year-old woman who alleges major tech companies designed their platforms to be addictive, contributing to mental health issues.

Defendants include Instagram and YouTube, while cases involving Snapchat and TikTok have been settled privately.

Lawyers for the plaintiff argue she became addicted to social media as a minor, leading to depression, body dysmorphia, and suicidal thoughts.

YouTube’s legal team has rejected the claims, arguing the platform is not addictive, and is comparable to video services such as Netflix, where users can stop scrolling at anytime.

On Feb. 18, Meta Chief Executive Mark Zuckerberg told the court the company had long since abandoned goals of “increasing time spent on apps,” instead focusing on engaging users through “creating value.”