Ding dong, "Momo" is dead, but not if you ask Buzzfeed, or the legions of parents, police and educators who are still warning about the mythical online menace. On March 6, Buzzfeed staffers fanned out ...

Editor's note: This article features disturbing content and mentions of suicide. Police and schools are issuing warnings to parents on social media after a popular WhatsApp challenge has resurfaced in ...