In a press release Facebook said that it was making the feature available to allow people who upload a emplate of their faces to protect their privacy.
They say they thought some people would want to be notified of pictures they might not otherwise know about.
However, they wont notify those in Canada and the European Union.
Privacy laws are generally stricter in those jurisdictions, though they said they were hopeful about implementing the feature there in the future.
If one opts in, Facebook generates what it calls a template of a person’s facial geometry by analyzing pixels from photos where the person is already tagged.
It then compares newly uploaded images to the template.
Under the new feature, people who have opted in would get a notification from Facebook if a photo of them has been uploaded, although only if the photo is one they have access to.
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