Another benefit of privating your instagram from non-muhrims is that you won't make a fuss of yourself if your friends' aurah is exposed.
I am VERY particular about that.
Before this, before uploading any pictures on instagram, I would zoom in (I mean like zoom zoom in) every details of my friends in the picture to see if there is any aurah exposed. One time, I've uploaded A picture like three or four times! That is very tiring T.T ! Worth it, though. You know, you don't wanna be the reason if anyone goes to hell..