How will Australia's social media ban work?

There are an estimated 440,000 young Australian teens, ages 13 to 15, on Snapchat. On Instagram, 350,000 in that age group are active users, and on TikTok, 200,000. Even Facebook - not exactly squarely in the Gen Alpha zeitgeist - reportedly has 150,000.

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Come Wednesday, those numbers are supposed to drastically change under a landmark law that will require users in Australia to be at least 16 to have accounts on those platforms and other social media services.

The rollout of the law, kinks and all, will be closely watched by parents, researchers and government officials around the world. Australia's experience may serve as a template for authorities in other places - including Denmark, the European Union and Malaysia - planning to impose similar restrictions, or a cautionary tale of the potential pitfalls.

What social media services are covered by the law?