Other smaller start-ups are also trying to use technology to address the issue.
SafeToWatch is developing software that is trained by machine-learning techniques to block inappropriate scenes including violence and nudity in real-time.
It analyses the context of any visual material and monitors the audio.
It suggest this provides a balanced way for parents to protect their children without intruding too deeply into their privacy.
“We never let parents see what the kid is doing, as we need to earn the trust of the child which is crucial to the cyber-safety process,” explains founder Richard Pursey.
Ruth suggests it’s often easy to blame parents, adding that safety tech only helps in limited circumstances as children become more independent.
“Most parents can’t know what exactly goes on their teenager’s mobile phone and monitor what they have seen,” she says.
And many experts agree that it is inevitable most children will encounter inappropriate content at some point, so they need to gain “digital resilience”.
“Safety online should be taught in the same way as other skills that keep us safe in the physical world,” explains Dr Linda Papadopoulos, a psychologist working with the Internet Matters safety non-profit.
“Parents should have frank conversations about the types of content kids might encounter online and teach them ways to protect themselves.”
She says the average age children are exposed to pornography is 11. When this happens, she advises, parents should try to discuss the issues involved rather than confiscating the device used to view it.
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