Since they own it (bought in '12), aren't those tracking results just feeding right back into the monster? The ad features work between FB Pages and Insta, so there seems to be significant sharing of some info.
TL;DR - If you want to stay on Insta, deleting FB may not do you one goddamned bit of good.
We must demand opt-outs. No compromise. No selling info without permission. If that means a monthly fee for use of a service, so be it.
The horrible thing is, if you want off both FB and IG, what do you replace them with? Where is an acceptable substitute?