Carly Ryan was the apple of her mum's eye.
So when the 15-year-old was left for dead by a 50-year-old predator posing as a teenager online, mum Sonya channelled her grief into something amazing.
The result was The Carly Ryan Foundation, Carly's Law and a campaign to educate young people about stranger danger online.
We caught up with this courageous mum who also had a few handy tips about how to work out if someone is exactly who they say they are.
Sonya is hoping to speak in Ballarat in 2018.
If you would like to get in touch about donating, counselling or information about the 'Thread' app, go to ... http://www.carlyryanfoundation.com/