Social media algorithms are one of the tools used by technology companies on the apps, games and websites we use every day. Things such as the videos you watch, links you click, pages you follow or accounts you interact with all help decide what content the algorithms show you.

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Dozens of councils are using privately developed software to "mass profile" benefit claimants, privacy campaigners say.

The algorithms, designed to predict fraud and rent arrears, "treat the poor with suspicion and prejudice", according to Big Brother Watch.

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