Yes you are correct. I don't want to promote any new or different app. I am talking about the same app. Can I import their contact book and send them invited ?

Yes you are correct. I don't want to promote any new or different app. I am talking about the same app. Can I import their contact book and send them invited ? (of course with the permission of the user ? ) I am thinking on those lines. My app provides copyright free books in a particular language which is not very popular. Also, my app is the only app of this kind for that community.