Should we give up smartphones? New research has found that as social media use goes up, so does anxiety. Some think it is time for us all to turn off our phones.
Social media blamed as anxiety soars
Long-term: Oxford's Professor John Gallacher will examine how 50,000 UK teenagers' mental health changes over 10 years in the full BrainWaves study. Glossary
Survey - When you ask a group of people questions about what they think about a particular topic.
Social media - Social media is defined by websites, apps and social games that connect people to each other through the sharing of pictures, thoughts, ideas, articles, and other content.
Anxiety - A feeling of unease or worry. It can be mild or very severe.
University of Oxford - A top university in the UK.
Mental health - The part of your health that has to do with your mind, your thoughts and feelings.
NHS - The National Health Service, the publicly funded healthcare system in the UK. The NHS was founded in 1948.
Smartphones - A phone that works in the same way as a computer, with apps, access to the internet and more.
Addicted - Unable to stop doing something.