So, it happened that one of my known associates Mr.X installed a certain app on his iPhone. In a few days, one of his family friends somehow came to know that Mr.X installed that app. How could someone possibly know which apps are installed on other's iPhone?
iPhone Apps – Is It Possible to Know Which Apps Are Installed on Another’s iPhone?
iphone
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Best Answer
If it were Apple ID information, it would contain only purchases and their dates, not whether the app is currently installed or not. That doesn't seem to be updated in Apple ID information realtime.
So direct interaction of the two parties on the app, or in real life can be a possible reason IMO.