Australia has passed a social media ban for children under 16, making it one of the toughest regulations targeting Big Tech. The law forces tech giants like Facebook and TikTok to stop minors from logging in or face fines of up to A$49.5 million ($32 million). The ban will take effect in a year after a trial of methods to enforce it starts in January. The move sets Australia as a test case for other governments that have legislated or plan to legislate age restrictions on social media due to concerns about its impact on young people's mental health.