Australia has added message board Reddit and livestreaming service Kick to its list of social media platforms that must ban children younger than 16 from holding accounts.

Communications Minister Anika Wells said on Wednesday the platforms join Facebook, Instagram, Snapchat, Threads, TikTok, X and YouTube in facing a world-first legal obligation to shut the accounts of younger Australian children from December 10.

Platforms that fail to take reasonable steps to exclude children younger than 16 could be punished with a fine of up to 50 million Australian dollars ($33 million USD).

"Online platforms use technology to target children with chilling control. We are merely asking that they use that same technology to keep children safe online," Wells said.

Australia’s eSafety Commissioner Julie Inman Grant will enforce the social media ban.

She said the list of age-restricted platforms would evolve with new technologies.

Inman Grant said she would work with academics to evaluate the impacts of the ban, including whether children sleep or interact more or become more physically active.

Australia’s move is being closely watched by countries that share concerns about social media impacts on young children.

Critics of the legislation fear that banning young children from social media will impact the privacy of all users, who must establish they are older than 16.

Wells recently said the government seeks to keep platform users’ data as private as possible.

More than 140 Australian and international academics with expertise in fields related to technology and child welfare signed an open letter to Prime Minister Anthony Albanese last year opposing a social media age limit as "too blunt an instrument to address risks effectively."