Reddit's launched a High Court challenge to Australia's pioneering social media ban for under-16s. 

The country's new law, which sets a mandatory age limit of 16 or older for accounts on certain platforms, including Reddit, took effect on Wednesday. 

Reddit's case argues the policy has serious implications for privacy and political rights.

New South Wales University Law Professor Rosalind Dixon says Reddit isn't a bad plaintiff. 

"If they can show that young people's political communication is burdened or that adults learning from young people and hearing from them is burdened, they're up and running." 

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