Georgina RannardScience correspondent
Жители Санкт-Петербурга устроили «крысогон»17:52
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They contacted Facebook, which at the time dominated the social media landscape, asking for help scouring uploaded family photos - to see if Lucy was in any of them. But Facebook, despite having facial recognition technology, said it "did not have the tools" to help.
Mean SSIM understates the threat. Max same-font SSIM reveals it.