As someone who's never used cloud-based photo browsers... I always assumed the facial recognition aspect was primarily for social media apps that try to tag known faces from a user's friends group, to put it in those people's news feeds or something. It's one reason I avoid being photographed and ask people not to tag my name to my face if they do post a photo I'm in. I'm wondering, what's the utility of facial recognition if you're storing/sharing photos on a service that has no database of known faces? Or is this just for image editing or red eye removal or something?
[edit] as I'm rethinking it, would this just be for searching your own images for a particular person...?