Instagram is the worst social media site in terms of its impact on the mental health of young people, a report has suggested.

The #StatusofMind survey found the photo-sharing app negatively impacted on people's body image, sleep and fear of missing out.

However, the survey of 1,479 youngsters aged 14 to 24, found Instagram was positive in terms of self-expression and self-identity.

Respondents were asked to score how each of the social media platforms they use impact upon issues such as anxiety, loneliness and community building.

The site with the most positive rating was YouTube, followed by Twitter. Facebook and Snapchat came third and fourth respectively.

The Royal Society for Public Health (RSPH) report said: "The platforms that are supposed to help young people connect with each other may actually be fuelling a mental health crisis."