'When I was a teenager in 2013, these filters were available in their early forms on Instagram and Snapchat, since TikTok wasn’t yet invented. Even though the filters I used back then were relatively crude compared to today’s offerings, they still consumed my life – and my self-perception'

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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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