Black doesn't dwell on the horrors of individual cases but prefers to talk about what can be done to stem the sharing of child-abuse images online. "Can't our phones recognise parts of a body and stop the image being taken?" she asks. "That's the challenge I want companies such as Apple to take up, to stop technology being a mechanism by which our children's innocence is being stolen.

I'm sorry but this simply doesn't seem practical. It seems like implementing this would be a significant technical challenge and thus be expensive and it wouldn't apply to most people whatsoever. And the folks who did apply to would just change phones or use different software. It just seems that if you implemented this technology the ones it applied to would simply find ways around it. Right now there's billions of phones in circulation with very good cameras that don't have this tech.