Jonathan Haidt (and Australian parents) on giving young people a smartphone-free adolescence

In the last year, there's been a surging interest from parents around the country to limit their children's access to smartphones and social media, due to concerns for their mental health.  Much of this momentum has been motivated by the research outlined in a new book by social scientist Jonathan Haidt, 'The Anxious Generation'.  So what does Haidt's work show about the link between smartphones, social media and the youth mental health crisis?  And how are parents in Australia already taking collective action to give their children a smartphone-free adolescence?