Girls’ much-higher rate of depression than boys is closely linked to the greater time they spend on social media, and online bullying and poor sleep are the main culprits for their low mood, new research reveals.

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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.

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