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Australia is banning children under the age of 16 from using social media, after its parliament approved the world's strictest laws. Tech companies could be fined up to A$50m ($32.5m; 拢25.7m) if they don't comply. But as many parents know, keeping teenagers off social media is a challenge. So, can a ban like this really work? And how might it be implemented? Lucy Hockings speaks to the 麻豆官网首页入口's cyber correspondent Joe Tidy and our Sydney correspondent Katy Watson.