Facial grouping in Google Photos is one of the most impressive features of the service. Not only can you see all pics and videos you've taken of a person or pet, you can also use that in search to find specific snaps like "me in Vienna" or "[person] and [other person/cat/dog]" or "[person] and food" for example. But Google's algorithms aren't infallible and there are instances when you have to remove certain pics for wrong identification, or merge what it thinks are two different faces. Photos is aware of that and has been asking users on the web to help it improve its facial recognition.

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