SYDNEY - Australia's internet watchdog on Wednesday widened its world-first teen social media ban to include Reddit and video live streaming platform Kick, and said more sites could be added if their main role was to enable online social interaction.

Australia will become the first country to fine social media firms up to A$49.5 million ($32 million) if they fail to take reasonable steps to block users aged under 16. The law will become effective from Dec 10.

The eSafety Commissioner on Wednesday urged tech firms to continually assess whether they meet the definition of an 'age-restricted social media platform' when they introduce new features or their primary usage changes.

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Discord, GitHub, LEGO Play, Roblox, Steam and Steam Chat, Google Classroom, Messenger, Meta Platforms' WhatsApp and YouTube Kids do not currently meet the criteria for an age-restricted social media platform, the regulator said.

Facebook, Instagram, Snapchat, Threads, X, and Alphabet-owned YouTube have already been included in the list.

There will not be a static list of companies that are age-restricted because of the fast-changing nature of technology, eSafety said.

READ MORE: Australia's social media curbs set to protect kids

When new tech platforms emerge or existing ones change their purposes, eSafety said it may reassess those services.

"We will continue to take a whole of ecosystem approach, but we want to reinforce that just because a service is excluded, it does not mean it is absolutely safe," eSafety Commissioner Julie Inman Grant said in a statement.