As you point out, face recognition is a feature that we're rolling out in Canada. It's something we've offered in many parts of the world for quite some time—probably around six years at this point. The primary use of face recognition technology is to suggest that people tag each other in photos. For example, if I upload a photo of Kevin, I might get a suggestion to tag him. That enables him to know that the photo exists, take action if he wants to do that, report it to Facebook if he has a concern, and all those things. We've also expanded our use of face recognition to enable people to better manage their identities so that, for example, you know if somebody's impersonating you, you know if somebody has posted a photo of you and they haven't tagged you, and also for accessibility purposes.
On April 19th, 2018. See this statement in context.