A constitutional fight is brewing over Australia's world-first social media ban, according to top legal scholars.

YouTube emerged as the most likely source of a challenge to the ban in July, when parent company Google first raised the prospect.

But experts in constitutional and media law told the ABC that doubts about the ban's constitutional validity extended well beyond the board rooms of the companies that would stand to gain from a victory.

They argue the policy could ultimately be overturned in the High Court because of its impact on the implied right to freedom of political communication, and believe that young climate activists such as 16-year-old Ivy Sheng showcase that risk.

The year 10 student uses Instagram to promote her podcast about environmental justice, as well as shari

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