It wouldn't be the least bit surprised if every stat FB has fed me was blown extremely out of proportion.
I'd say about half my friends in their late 20s to their mid-late 30s have deleted their Facebook. A majority of the other half of people I know have deleted it off their phones. A majority of those are highly educated professionals with a like-minded social circle in the Bay Area. None of which are in the tech industry though.
My parents and their friends seem to use it regularly still, mostly cause it was such a useful communication tool for a network they lost contact with. Replaces an address book for them.
IG seems to be saturating a majority of phone screens I see in passing. Usually stories. I have noticed a decline in my friends circle with that. People are posting a lot less as of recent. As a media person, I'm seeing less return from IG without an immense amount of effort. I believe the feed is far beyond it's max saturation level. The same thing happened to Twitter for me. You either have to go all in and game the system or relinquish all reliance on it as an important media outlet.
There is no statistical base to my findings, just something I have observed.