Online age verification can be done effectively, but there's no "one-size-fits-all" solution, a major study commissioned by the government as part of its social media ban has found.

But it also identified risks to privacy, potential bias and issues with accuracy, depending on the method used.

The study examined multiple approaches to check ages and dozens of companies was released last night, a few months out from the start of Australia's ban on social media use for children under 16.

The report found age assurance could be done "privately, efficiently and effectively" and there were "substantial technological limitations preventing its use.

But there were concerns around cybersecurity, and unnecessarily keeping users' data.

"This report is the latest piece of evidence showing digi

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