The latest stories from the Technology section of the BBC News web site.
A shortage of infant formula across America has led parents to share supply locations online.
The growth of "smart" farm machinery is increasing the risk of hacking of food and farming systems.
The UK, US, Australia and New Zealand have also barred the Chinese telecoms equipment makers.
The social media platform says it will put false claims from official accounts behind warning notices.
Firms are developing smart contact lenses that can project data in front of the user's eye.
Optical-fibre cables could spot tsunamis or the effect of climate change on currents, researchers say.
Prosecutors will ask whether social platforms were "used to stream, promote, or plan" the murders.
The Conti cartel, which is thought to be run from Russia, has upped its ransom demand to $20m (£16m).
A growing number of young people are getting into crypto trading - despite the risks.
The US streaming giant is forced to lay off staff to minimise cost of viewers quitting the service.
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