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It's even better than that. It can recognize landmarks. I can ask it "Show me pictures of myself in Paris" and it finds 25-year-old scans that I uploaded that haven't got any kind of geographic data in the EXIF.

The technology underpinning this stuff has been brewing / percolating / developing for years [https://play.google.com/store/apps/details?id=com.google.and...]

Automatic photos classification is just the most visible iteration of the tech.

You don't even need to tag faces. It finds all the faces that have been in your photos and picks one for each to be the search "face" for that person.