Was it a push notification? Or did you have to open the app to see it?
It's silent unless there was a proactive message to you from Facebook that your face will start to be recognized. This facial recognition happens even when you're not using the app.
So Facebook is waiting for you to take action before telling you anything. That is not proactive, it is silent.
What if you don't go on Facebook any more but have an account? You'd never know this was happening.
It may be silent for some people and you're intentionally ignoring that. For someone who has an account but does not regularly log in, this change is silent. Yes, you saw the message, but that was by chance. Many others will have this feature silently enabled without their knowledge.
"I didnt get any mail. I also havent checked my mailbox for packages."
"I didnt get your email. I have not logged into my account lately."
It seems like semantics. You expect facebook to send an EXTERNAL notification to an operating system like ios/android or to an email provider like gmail/hotmail. Other people consider it not silent for facebook to make sure it shows up in their newsfeed.
Good for you but I don't open the app too, I wouldn't know what Facebooks does with the app but I guess Mark Zuckerberg enjoys The Hitchhiker's Guide to the Galaxy.
