Facebook has had a string of disasters around trust with user privacy (just think of Cambridge Analytica and WhatsApp metadata). Their philosophy has been shown to be: Cross the line as quietly as you can, and if caught, apologise, and do it later in a better way. Mark Zuckerberg has publicly made promises on live video interviews, which he has just broken years later (remember the one that "you own your data").
So sorry, but I really 'see' this as a pretty invasive frontier for Facebook. I'd rather trust some other company, and more so if it was fully open sourced, so we can examine how it works and what the safeguards are. Trust is the big issue!
See
Facebook and Ray-Ban’s smart glasses leak before launch#
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Would you wear these Facebook Wayfarers?
