More smartphones than ever are finding their way into the hands of children.
Last year the Australian Federal Police (AFP) received more than 10,000 reports of child exploitation material, arresting 91 alleged offenders.
50% of kids reported sharing photos of their face online.
While about a quarter said they had shared their last name or real age.
6% went on to share their phone number or address online.
AFP National Coordinator for Exploited Children, Jayne Crossling, says keeping kids safe on the web has never been harder.
To tackle this, the federal government is expanding the existing Think-U-Know cyber safety program to cover school children as young as four.
The training will include information about the dangers of self-produced sexually explicit material; the grooming of children through online apps and games; and the importance of adult supervision.
The 'Think u know' program will be delivered by special police and cyber safety trainers nationally.
It also covers cyberbullying, with complaints last year skyrocketing by 63 percent.
The aim, to prevent incidents such as the alleged bullying that led to the suicide of Northern Territory teenager Dolly Everett last month.
