Instagram and Snapchat are really bad for young people's mental health, according to research by two health organisations. Virtually all major social media platforms have a negative impact on the well-being of 14-24-year-olds, the study adds. Instagram was the worst -- followed by Snapchat, Facebook, and Twitter. From a report on The Guardian: Instagram has the most negative impact on young people's mental wellbeing, a survey of almost 1,500 14- to 24-year-olds found, and the health groups accused it of deepening young people's feelings of inadequacy and anxiety. The survey, published on Friday, concluded that Snapchat, Facebook and Twitter are also harmful. Among the five only YouTube was judged to have a positive impact. The four platforms have a negative effect because they can exacerbate children's and young people's body image worries, and worsen bullying, sleep problems and feelings of anxiety, depression and loneliness, the participants said.