TikTok's US business, now run as the TikTok USDS Joint Venture, has joined Lantern, a scheme for sharing signals of harmful behaviour and content across online services.
Lantern, which launched in 2023, lets member companies exchange information so they can spot offenders as they move between platforms.
Its list of participants already includes Google alongside other large technology firms.
"Cross-platform collaboration is essential to identifying and disrupting child sexual exploitation and abuse," said Marc Leone, Lantern's director.
The move comes about eight months after TikTok's US operation was spun out into the joint venture as part of a restructuring of its American business.
As a US-based operation, the venture has been reporting cases to the CyberTipline run by the National Center for Missing and Exploited Children (NCMEC), the body that handles reports of child sexual abuse material in the United States.
TikTok said it was committing $2 million to NCMEC to help modernise the CyberTipline, part of a three-year, $10 million project that also draws contributions from Amazon Web Services, Microsoft and Palantir.
Lantern says its members had shared more than 2 million signals by the end of 2025.
TikTok's entry ties it into an industry-wide shift towards shared threat intelligence, as regulators and lawmakers press platforms to strengthen age checks and child-safety measures.
