Online friends and teen mental health: who teens chat with matters, study finds

Who teenagers talk to online may matter as much as how much they talk, according to a study from Stockholm University published on Wednesday, 4 November 2026, in the journal Child and Adolescent Mental Health. Researchers looked at 3,034 Swedish 15-year-olds and found that frequent online contact with close friends and larger friend groups went along with better mental well-being, while regular contact with friends known only online went along with poorer well-being, especially for girls and for teens who saw their families as less well-off.

Most public debate about young people and screens asks one question: how many hours are they online? This study suggests that question is incomplete. Teenagers use the same apps to chat with school friends, to keep up with a wider group, and to talk to strangers they have never met. The Stockholm team found that these three kinds of contact did not go with the same outcomes. Staying closely in touch online with friends they also know in real life was associated with feeling better, while frequent contact with friends known only online was associated with feeling worse.

The authors' message, as described by the corresponding author, is that it is not only the amount of online communication that matters but also who adolescents are communicating with. For young readers, that is a practical way to think about their own habits: an evening of messages with close friends is not the same as hours of chatting with people they have never met.

The finding about girls and about teens from less well-off families is important because these groups may be more exposed to the risks of online-only relationships. The study measured family wealth by how the teenagers themselves saw it, not by actual income, which is one of its limits.

There are other limits too. The data come from surveys taken at single points in time, so the study cannot say whether online-only friendships make teens feel worse or whether teens who already feel low seek out online-only friends. The authors also note that the results come from one country and one age group, which limits how far they can be applied elsewhere, including to young people in India.

Peepals timeline: The data were collected in Sweden's HBSC survey rounds of 2017/2018 and 2021/2022, four years apart. The researchers pooled both rounds, analysed 3,034 responses from 15-year-olds, and published the results on 4 November 2026.

Short-term: The study gives parents, teachers and young people a more specific way to talk about screen use, focusing on who teens talk to online and not only on screen time.

Long-term: If later research that follows the same teenagers over time confirms the pattern, school well-being programmes and online safety guidance could pay closer attention to online-only relationships, especially for girls and young people from poorer homes.

Who is affected: Teenagers and young adults who socialise online, their parents and teachers, school counsellors, and those who design online safety and digital well-being programmes.

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