Over the last year, calls to ban social media for under-16s in the UK have grown considerably louder.

As we speak, governments all over the world are considering sweeping restrictions, schools are shifting or tightening policies and parents are vocalising more concern. But what does the actual research say about such bans?

A fresh report from the University of Cambridge’s Digital Mental Health Group offers one of the most comprehensive, evidence-based reviews of this debate. Its conclusions are nuanced and might even surprise you.

The big picture: harm exists, but the solution isn’t clear

The report draws a critical distinction between two types of evidence: individual-level harm (clear and serious cases) and population-level effects (overall trends across many young people).

The report acknowledges that, yes, social media can cause real harm for some young people. Such harms can include exposure to distressing or harmful content, cyberbullying, sleep disruption, addictive patterns of use and, in extreme cases, can play a role in young people’s self-harming behaviours or suicide.

That said, across the whole population, these effects have been determined to be “small and uncertain”. When researchers ‘zoom out’, the picture becomes more complex. It is true to say that there is a correlation between social media use and poorer mental health, but the effect sizes are small and the available evidence is inconsistent and of low-quality.

Most available studies are correlational, meaning that we cannot be sure that social media per se causes poor mental health. It could be the reverse (struggling teens might simply be drawn to using social media more). Or, both could be influenced by other factors (family environment, levels of available social support to teens etc).

The key question: do bans actually help?

Here’s where the report delivers its most important and perhaps unexpected finding. There is no strong experimental evidence that banning social media improves mental health in adolescents.

Currently, we do not have any large, well-designed studies testing full bans in healthy under-18s and very limited research on reducing usage in general populations. This means that policymakers are currently operating with very little causal evidence. Even when researchers look at reducing social media (not banning it), the results are mixed.

In adolescents:

• A Danish study reduced usage by 1 hour/day and found no improvement in wellbeing.
• A Canadian study (with already vulnerable teens) found improved anxiety, depression and sleep.

Reducing social media may help some young people, but not all, and certainly not consistently.

In adults (where more data exists), social media abstinence seems to lead to little or small positive effects and social media reduction can lead to small but meaningful improvements to wellbeing. Shorter term restrictions appear to make adults feel worse and longer-term changes seem more promising in terms of improvements to wellbeing. So, the learning here is that sudden restriction might actually backfire; humans need time to adjust!

The policy dilemma: act now or wait for better evidence?

The report articulates a central tension between two options (a) implement bans now, despite weak evidence or (b) wait for stronger research, while harms continue. The authors claim that neither is risk-free. They acknowledge we need to do more to support teens, but a full ban is not strongly supported by available evidence.

Countries like Australia have already introduced social media bans, but rigorous evaluations are still ongoing. Anecdotal reports are currently showing mixed outcomes. Some teens are reporting less stress following the ban and healthier habits. Others are reporting little change, documenting how easy it is to circumvent bans and reporting increased feelings of social isolation (particularly among more marginalised young people).

What might the takeaways be?

One-size-fits-all policies may not work.

A blanket ban might protect some students, but harm others.
Focus on context, not just screen time.

Time spent online is only one piece of the puzzle.

What are young people looking at? In what context are they viewing it? and what purpose is that digital interaction serving in their life?

Social belonging is critical.

Restricting access while peers remain online can create social exclusion
effects, which may worsen wellbeing.

And at school?

Schools should prioritise educating pupils on topics such as digital literacy and digital wellbeing as a priority. Pupils need to feel empowered and not simply feel at the mercy of the digital world.

Sustainable change may matter more than strict rules and all adults (educators and parents) should work together to engage young people, show curiosity about young people’s digital interests and how the digital world is making them feel. For now, the most evidence-aligned approach in schools and at home, is not extremes, but informed, flexible and context-sensitive guidance.