Canberra, Sept. 16 -- Social media companies will be required to detect and deactivate accounts held by underage children when Australia's world-first under-16 ban comes into effect in December, the government revealed on Tuesday.

The federal government on Tuesday released regulatory guidance for technology companies to comply with the under-16 social media ban ahead of it coming into effect on Dec. 10.

The guidance says that social media platforms will be expected to initially focus on the detection and deactivation of existing accounts held by children younger than 16, and on taking reasonable steps to prevent those whose accounts have been removed from immediately creating a new account.

Platforms will not be required to test the age ...