After the BI report, Facebook admitted it had built such an app but it was never released publicly.
However, it disputed that the app couldnt identify any/every member of the social web link.
The app has since been discontinued citing privacy concerns among users.
As a way to learn about new technologies, our teams regularly build apps to use internally.
The facial recognition feature isnt something new to Facebook.
However, this feature has since been made opt-in only.
Also Read-Facebook Gave Tinder Special Access To User Data
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source: www.techworm.net