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Microsoft's OneDrive spots your mates, remembers their faces, and won't forget easily
(www.theregister.com)
This is a most excellent place for technology news and articles.
If you really want it, you should be able to enable it. No reason to do that with the other 90% who don't need it.
So your argument now is just that it should be disabled by default?
Regarding electricity: yes
Regarding privacy: no, but my privacy views are based on what we have in Germany, where the feature might not be allowed at all.