The world’s biggest information and communications companies dominate our lives, in many ways. Google, Apple, Microsoft, among many others - we use their products to write up work reports, store our photos, and send messages to our loved ones. Sometimes hourly.

And yet, these same companies, according to recent research, are arguably enabling paedophiles to commit the most heinous of crimes against children. On a scale never before seen in human history.

These companies are also producing the technology needed to crack down on these crimes, so why aren’t they using it?

Today, international and political editor Peter Hartcher on the shocking social crisis that’s been hiding in the shadows. And the two government commissioners who are fighting to protect the most vulnerable people in our society.