@WarnerCrocker cross posting Apps have been around for broadcasting one way informational posts (I think android has had more) it is just that some social platforms included are newer, so, new apps, iOS anyway.
I think it might be Tapestry that is attempting the interactive seamless fusion I desire. It may still be a work in progress however. It was kickstarted.
TIL- there is also a shopping app named croissant.