Australia’s social media ban for youths took effect Wednesday, a landmark move that’s drawn global attention at a time governments are increasingly enacting rules to shield minors from toxic content and cyberbullying.The law, passed last year, mandates services such as ByteDance Ltd.’s TikTok and Meta Platforms Inc.’s Instagram keep under-16s off their platforms or face fines of up to A$49.5 million ($33 million). Australia becomes the world’s first democracy to undertake such a crackdown in response to gro ...