Screen time limits alone won't fix social media harm, global experts warn

A coalition of global health experts published a stark warning this week: telling young people to spend less time on their phones will not solve the damage that social media is doing to their minds. The message, delivered through a series of papers in the Lancet, cuts to the heart of how the platforms themselves are built—not as neutral tools, but as machines engineered to keep users scrolling, watching, and coming back.

The research synthesized findings from nearly 2,800 studies and documented a clear pattern of harm. Depression, anxiety, sleep disruption, and reduced physical activity cluster around heavy social media use in young people. Some benefits exist too—connection with distant friends, access to educational resources, the feeling of belonging to a community. But the architecture of these platforms, experts say, tilts overwhelmingly toward the addictive side. Infinite scroll, targeted algorithms, AI-driven recommendations—these are not accidental features. They are business decisions. Social media companies make their money by keeping users on the platform as long as possible and harvesting data about what they like, what they share, what they click back to. That information becomes the currency of digital advertising.

Dr. Shaw, one of the lead voices in the Lancet series, put it plainly: the problem is not technology itself, but the choices companies make about how to deploy it. "A perfect example is the bottomless scroll," he explained. "If the page you're looking at has no end, it makes it much more difficult to close off that sort of session or that activity." For many young people, this design choice translates into compulsive behavior—the inability to stop even when the experience no longer feels good.

Tech companies have long defended themselves by saying the evidence of mental health harm is not conclusive enough, that correlation does not prove causation. The Lancet authors acknowledge the difficulty of establishing direct cause-and-effect relationships in such complex systems. But they argue that the sheer scale of digital media's presence in young people's lives, combined with the fact that some are more vulnerable to harm than others, justifies what they call "precautionary public health action." That means government regulation. That means forcing platforms to redesign their business models around child safety instead of engagement metrics.

Canada is moving in that direction. Two proposed bills—the Safe Social Media Act and the Protecting Privacy and Consumer Data Act—would restrict social media access to people 16 and older and create a Digital Safety Commission to oversee tech companies. The legislation includes a crucial incentive: companies that can demonstrate "adequate safeguards" for children would be exempt from the age restriction. Shaw said this approach "got it pretty much exactly right." The logic is elegant: make safety the price of market access. Australia has already imposed similar age restrictions. Dozens of other countries are watching and considering their own versions.

Yifan Zhou, a 30-year-old Canadian who served on the youth advisory group that informed the Lancet papers, spoke to both sides of the equation. Social media has genuine value—it connects people across distances, democratizes information, builds community. But she has also listened to young people describe the loneliness that comes from reduced face-to-face interaction, the anxiety that blooms when you compare your life to the curated highlight reels of others. She shared a story about a family member who was a teenager when an online predator began contact. The abuse went on for years before anyone in the family knew. "They felt ashamed," Zhou said. "They also didn't know that it wasn't the way it's supposed to be, but the kind of regulations and also the education and a lot of things weren't in place."

Dr. Michael Cheng, a psychiatrist at the Children's Hospital of Eastern Ontario, has watched the shift in real time. Years ago, when young patients were admitted to the hospital, their first question was whether their parents could visit. Now it is often: "Do I get to keep my cellphone?" Cheng was not part of the Lancet research, but he sees the same patterns in his clinical work—the addictive pull of these platforms, the mental health consequences. What strikes him most is the global convergence. "I remember 10, 15 years ago, those that were concerned, it felt like we were yelling and crying into the wind," he said. Now the concern is mainstream, backed by research, moving governments to act.

Zhou ended on a note of cautious optimism. Yes, digital technology has evolved faster than regulation. Yes, the gap between innovation and protection has left young people vulnerable. But change is possible. "The release of this paper is something that gives me hope," she said. She also sees young people themselves taking agency, co-creating solutions, refusing to be passive. That momentum—from research, from regulation, from youth themselves—may finally be enough to push the platforms toward a different design, one that prioritizes well-being over engagement, safety over scroll.