BBC News By Zoe Kleinman image copyrightGetty Images There remains "little association" between technology use and mental-health problems, a study of more than 430,000 10-15-year-olds suggests. The Oxford Internet Institute compared TV viewing, social-media and device use with feelings of depression, suicidal tendencies and behavioural problems. It found a small drop in association between depression and social-media use and TV viewing, from 1991 to 2019, There was a small rise in that between emotional issues and social-media use. Happy people "We couldn't tell the difference between social...