The BBC has been contacted by hundreds of users who claimed they had been wrongly banned from the sites.
YouTuber Harry Jackson has made a film about his epic two-wheeled journey.
Gloucester's annual cheese-roll has become a magnet for content creators in search of clicks.
The trial had been set as a test case for 1200 other school districts making similar claims.
YouTube said it worked with experts to provide appropriate experiences. TikTok said it was disappointed Ofcom had not acknowledged its safety features.
Under the scheme, 150 media professionals, including producers and journalists, will develop their skills.
The YouTuber, Piotr Hancke, had celebrity backing for his nine-day, non-stop livestream.
MrBeast's media company has been sued by a former employee over claims of sexual harassment and workplace gender bias.
It comes as the government continues to consult on whether to ban under-16s from social media in the UK.
