EU tech regulators charged social media platform TikTok on Friday with breaching the bloc's online content rules due to the so-called "rabbit hole" effect of its recommender system, which attracts users' attention to a constant stream of similar videos.
TikTok's Chinese owner ByteDance risks a fine next year of up to 6% of its global annual turnover unless it can resolve the issue.
Social media companies are under pressure to modify their algorithms amid growing concerns worldwide that their platforms are contributing to a mental health crisis among children, prompting some governments to impose or consider bans for underage users.
The European Commission, which acts as the EU tech regulator, said it issued charges known as preliminary findings to TikTok after the company failed to implement proportionate, reasonable and effective mitigation measures to address the risks.
It said endless and repeated exposure to content about sadness, isolation or body image can have a detrimental impact on users' mental health.