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This App Warns You if Someone Is Wearing Smart Glasses Nearby - 404media
(www.404media.co)
This is a most excellent place for technology news and articles.
Yeah: they'd be pointing the phone at you.
Yeah, but the issue is intent and actual usage. I don't want to fuck up my neck by always looking down at a 30deg angle, so I do try to view things on my phone more level with my face. I avoid pointing it directly at people, but I can't change how others would interpret that.