The happiness levels of nearly 10,000 girls and boys were tracked between the ages of 10 and 15. Girls who spent more than an hour a day on social media from the age of 10 were more likely to suffer problems.
News & Comment
What is 'bait out'?
"Bait out" pages are online groups or pages that invite users to share nude images, videos or sexual gossip about others, according to Childnet .
Users are often only allowed access to the group or page once they have shared such content.
It's a sensational story containing allegations of sleaze, psychological manipulation and data misuse that has provoked an internationally furious response.
Tech giant Facebook and data analytics firm Cambridge Analytica are at the centre of a dispute over the harvesting and use of personal data - and whether it was used to influence the outcome of the US 2016 presidential election or the UK Brexit referendum.
Both firms deny any wrongdoing.
Are you a teacher of 8-16-year-olds? Ask your pupils to complete the appropriate survey. They could do it for homework or during break time. It only takes 10-15 minutes.
You can then access free teaching resources to use with your pupils AFTER they have completed the survey. This includes a resource that takes you through the correct answers to the test questions and a booklet with ideas of how to embed critical literacy within your classroom.
This Safer Internet Day we want to empower children to have a positive time online and inspire everyone to ‘Be the change’ and use the positive power of image to help create a better internet. As part of this we are running a national youth photography campaign exploring the power of images in digital youth culture.
One parent who knows the dangers of sexting more than most is Roz Carver, 47, who lives in Gloucestershire with her children Kate, 17, and Joe, 20. Here, she explains how it impacted Kate's life and the whole family...