Well, if I kept a diary, I wouldn't share it with others.
But I don't keep a diary, so I guess there's no book I wouldn't share with others, assuming it isn't too XXX rated, of course.
I don't have any of those either. I have a couple of special books but if anyone wants to read them? That's fine with me.
I can't remember ever sharing a book. I read them and return them to the library.
Duh, I don't share that!