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

Australia will impose a social media blackout for children under the age of 16 to tackle a growing mental health crisis among young people. But will the ban be effective?