Children searching for content relating to depression and self-harm can be exposed to more of it by the recommendation engines built in to social networks.
Sophie Parkinson was just 13 when she took her own life. She had depression and suicidal thoughts.
Her mother, Ruth Moss, believes Sophie eventually took her own life because of the videos she had watched online.
Several countries around the world are considering regulating social media - but what might that look like?
A new report has put forward a tranche of ideas that its authors say could end the "informational chaos that poses a vital threat to democracies".
Instagram has launched new technology to recognise self-harm and suicide content on its app in the UK and Europe.
The new tools can identify both images and words that break its rules on harmful posts.
As President Trump continues to dispute the result of the US election, false or misleading posts have been spreading on social media about the vote.
Some have been amplified by President Trump and his team, who have called into question the integrity of the election without providing evidence.
BBC's Reality Check Team has checked some of the main claims.
INEQE Safety Cards, providing you with a one-page guides on how to stay safe on popular platforms.
TikTok's pledge to take "immediate action" against child predators has been challenged by a BBC Panorama investigation.
The app says it has a "zero tolerance" policy against grooming behaviours.
But when an account created for the programme - which identified itself as belonging to a 14-year-old girl - reported a male adult for sending sexual messages, TikTok did not ban it.
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