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Researchers say Google's ad-targeting system sometimes makes troubling decisions based on data about gender and other personal characteristics.

"The big companies developing them show no interest in fixing the problem."

London's Metropolitan Police have been urged to back down on plans to once again use facial recognition software at next weekend's Notting Hill Carnival. Privacy groups including Big Brother Watch, Liberty and Privacy International have written to police commissioner Cressida Dick (PDF) calling for a U-turn on the use of the tech. Automated facial recognition technology will snap the party-goers' faces, and run them against a database. The aim is to alert cops to people who are banned from the festival or are wanted by the police, presumably so they can take immediate action. The tech was first tested at the festival - where relations between police and revellers are often strained - last year, but it failed to identify anyone.

"Croquet eliminates dedicated servers and server-side code from online multiuser apps. Instead, users connect through our worldwide network of public reflectors. Every input is mirrored by the reflector to a shared virtual computer that runs bit-identical across every client, so everyone stays perfectly in sync"