Rumours of child abductors spread through WhatsApp in a small town in Mexico. The rumours were fake, but a mob burned two men to death before anyone checked.
Adults who work with Young People News
Facebook has said that 8.7 million images of child nudity were removed by its moderators in just three months.
The social network said that it had developed new software to automatically flag possible sexualised images of children.
Data harvesting and sharing by mobile apps is "out of control", University of Oxford researchers have warned.
Nearly 90% of free apps on the Google Play store share data with Google parent company Alphabet, the Financial Times reported.
The app collects GPS coordinates on users even when they're not using it. By sharing that data, both Facebook and Instagram could collect huge amounts of information on users to better target ads.
Vast quantities of data on hundreds of thousands of people is being used to construct computer models in an effort to predict child abuse and intervene before it can happen, the Guardian has learned.
The full scale of online child sexual exploitation is difficult to know.
Sites are often disguised to make them appear legal, or are hidden on the dark web, which enables people to act anonymously and untraceably online.