Can children and teenagers be forced off social media en masse? Australia is about to find out.

More than 1 million social media accounts held by users under 16 are set to be deactivated in Australia on Wednesday in a divisive world-first ban that has inflamed a culture war and is being closely watched in the United States and elsewhere.

Social media companies will have to take “reasonable steps” to ensure that under-16s in Australia cannot set up accounts on their platforms and that existing accounts are deactivated or removed.

Australian officials say the landmark ban, which lawmakers swiftly approved late last year , is meant to protect children from addictive social media platforms that experts say can be disastrous for their mental health .

“With one law, we can protect Ge

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