Australia said on Wednesday it will add YouTube to sites covered by its world-first ban on social media for teenagers, reversing an earlier decision to exempt the Alphabet-owned video-sharing site and potentially setting up a legal challenge.

The Australian government has announced YouTube will be required to ensure account holders are at least 16 years old starting in December.

Australia said on Wednesday it will include Alphabet-owned YouTube in its world-first ban on social media for teenagers, reversing an earlier decision to exempt the video-sharing platform. Australia's internet watchdog last month urged the government to overturn the proposed exemption for YouTube after its research found 37% of children aged 10 to 15 reported seeing harmful content on the platform,