Yes, I think we shouldn't ask for user Pass and User name.
But, If you need to do it in your application you can use database/XML to do that. But only your application will treat the added user as a friend not the facebook.
In my application i added all friends in DB and also added my self as a friend of my self. so that i can do the task what is defined to myFriends role(in my application).
ID FBUserId Name
9705 1215966620 Abul Bashar
9706 1248090545 Tuhin Ahmed
9707 1251036547 Orijit Diponkor Shuvrangshu Tridib
9708 1252800907 Shahin Mahmud
9709 1263680515 Binayan Dey
9710 1275860308 Mitu Kumar Debnath
9711 1279017492 Ahmed Riaj
9712 1280150772 Mahbubur Rub Talha
9713 1287414234 প্রবাসী সারোয়ার
9714 1294159220 Md.Humayun Kabir
9715 1294340379 Shah Muhammad Mazed