The lawsuit filed in state court in Los Angeles last week accuses TikTok software of "intentionally and repeatedly" pushing the Blackout Challenge that led to the deaths of an eight-year-old girl in Texas and a nine-year-old girl in Wisconsin last year.
"TikTok needs to be held accountable for pushing deadly content to these two young girls," said Matthew Bergman, an attorney at the Social Media Victims Law Center, which filed the suit.
TikTok has invested billions of dollars to intentionally design products that push dangerous content that it knows are dangerous and can result in the deaths of its users.
The suit alleges that TikTok's algorithm promoted the Blackout Challenge to each of the girls, who died from self-strangulation -- one using rope and the other a dog leash.