For tweens and early teens, the rise in time spent on Snapchat, Whats-App, Instagram and other social media is really quite dramatic.
Our new study set out to look at patterns of behaviour among 10 to 15 year olds in the UK, and their levels of well-being, to see if this time spent online was having a detrimental impact on their mental health. We found that teenage girls are by far the highest users of social media, and those who are using it for more than an hour a day are also at the highest risk of developing well-being problems in later teen years.
We asked the young people to report on how much time they spent on social media on a "normal school day". We found that 10 per cent of 10-year-old girls reported spending one to three hours a day (compared with 7 per cent of boys) and this increased to 43 per cent of girls at age 15 (and 31 per cent of boys).
We assessed two measures of well-being. The first was a combined score of their answers to questions about satisfaction with schoolwork, friends, family, appearance, school and life as a whole. The second measure was a well-established questionnaire which asked the young people about their social and emotional difficulties.
At age 10, girls who interacted on social media for an hour or more on a school day had worse levels of well-being compared to girls who had lower levels of social media interaction. Additionally, these girls with higher social media interaction at aged 10 were more likely to experience more social and emotional difficulties as they got older.
While our study was unable to say that the higher level of social media use among girls directly caused the mental health issues, there was a strong association. For both boys and girls, levels of happiness decreased between the ages of 10 and 15, however the decrease among girls was greater than that of boys.
What makes girls different?
The amount of increasing time online is strongly associated with a decline in well-being among the young, especially for girls. Of course, young people need access to the Internet for homework, for watching TV and to keep in touch with their mates. But they probably don't need to spend two, three or four hours chatting, sharing and comparing on social media every school day.
There are number of possible reasons why girls are more affected by social media use than boys. Girls participate in more comparisons of their own lives with those of the people they are friends with or follow. Viewing filtered or photoshopped images and mostly positive posts may lead to feelings of inadequacy and poorer well-being.
Girls also feel more pressure to develop and maintain a social media presence than boys. Social media presence requires constant updating and having friends share or like their content. If their perceived popularity decreases over time, there may also be an increase in social and emotional difficulties.
Boys are much more likely to participate in gaming online and via consoles than they are social media, and that wasn't covered by our study. Boys' levels of well-being may be more related to gaming.
So what can be done to help protect young people from the potential damage to their mental health?
Social media interaction does not appear to be a short-lived phenomenon. A recent report by the Children's Commissioner for England, "Life in Likes", suggested imploring social media platforms to check underage use and preparing children better for life in a digital age.
The recommendations did not discuss potential gender differences; but the findings from our study suggest that boys and girls can have varying responses to high levels of social media interaction.
There have also been calls for the technology industry to look at in-built time limits. Our study really backs this up - the amount of increasing time online is strongly associated with a decline in well-being among the young, especially for girls. Of course, young people need access to the Internet for homework, for watching TV and to keep in touch with their mates. But they probably don't need to spend two, three or four hours chatting, sharing and comparing on social media every school day.
• The writer is a research fellow and Deputy Director of Graduate Studies, Institute for Social and Economic Research, University of Essex.