WhatsApp and Instagram seem to be much more respected than Facebook proper right now, so it kind of makes sense. I also haven't noticed a decline in usage of these apps among my friends, but posts on Facebook itself have really dried up.
Yes, that's my point. These people, in my head, are trying to minimize the damage done to their reputation, but without actually realizing that moving around inside Facebook doesn't really help. I seriously doubt that how Facebook, the product, is run is significantly different than how Instagram or WhatsApp is run. Anyone who just jumps around isn't trying to really address the root issue.
It says more about the individuals than it does about the company.
Install Facebook and Instagram on iOS. Launch FB and note how long it takes to start, now launch Instagram and do the same. Instagram starts up nearly instantly.
Now, force quit both apps and remove Facebook. Start Instagram and all of the sudden it takes much longer to start. I don't know why this is but it certainly shows a deep connection between the apps in a way that users are probably not expecting.