Google won't approve any Google Glass apps that use facial recognition software. Well, for now. Google said, "we won’t add facial recognition features to our products without having strong privacy protections in place". Strong privacy protections aren't in place right now, I guess. [Google]
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Just to note, there is a huge difference with won't approve and won't have support for when it comes to anything built on android. There are other app stores and sideloading.