Reddit has launched a challenge in Australia's highest court against the nation's landmark social media ban for children.

The online forum is among 10 social media platforms which must bar Australians aged under 16 from having accounts, under a new law which began on Wednesday.

The ban, which is being watched closely around the world, was justified by campaigners and the government as necessary to protect children from harmful content and algorithms.

Reddit is complying with the ban, but in its case will argue that the policy has serious implications for privacy and political rights. It is the second such legal challenge, with two Australian teens also awaiting a High Court hearing.

Despite the best intentions, this law is missing the mark, Reddit said in an update on its website.

There are more effective ways for the Australian government to accomplish our shared goal of protecting youth.

Australia's Communications Minister Anika Wells has previously stated that the government will not be swayed by legal threats.

In that case, which the High Court has agreed to consider at an as-yet undecided date next year, two 15-year-olds from New South Wales are claiming the social media ban is unconstitutional as it infringes the implied freedom of communication on governmental and political matters.

Experts fear kids are going to circumvent the ban with relative ease - either by tricking the technology that's performing the age checks, or by finding other, potentially less safe, places on the net to gather.

The policy has garnered support from some mental health advocates, but it is criticized by others for being impractical and overly broad.

Reddit pointed out that the ban forces unwarranted verification processes on individuals and can lead to a disjointed experience between different platforms, raising concerns about both security and community engagement.

With legal challenges appearing to grow against this unprecedented legislation, the outcome could have far-reaching implications not only for Australia but for social media regulation globally.