People are visiting derelict buildings and posting it online, but authorities warn it is unsafe.
The BBC has been contacted by hundreds of users who claimed they had been wrongly banned from the sites.
TikTok sensation Troy Hawke spoke about how people react to his compliments when he makes videos.
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.
Stephen Tetter creates viral TikTok videos to celebrate Kent teachers.
Those who don't subscribe will be able to use the platform for free - but be shown personalised ads by default.
While only rolled out to some users, the feature's bizarre AI-generated descriptions were shared widely.
The actor has branded the singer an identity thief - but plenty of fans think they're the same person.
