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 announced YouTube will be among the social media platforms that must ensure account holders are at least 16-years-old from December, reversing a position taken months ago on the popular video-sharing service.

The Australian government has announced that YouTube will be included in new legislation that bans children under the age of 16 from using social media.