as to what defines a loner. I consider it being an introvert. Being one myself, I define it as disliking large social situations where you have to make inane chit chat. Not shy, do sometimes enjoy being with a small group of friends, but being in big crowds of people you don't know and don't really care to know, can exhaust you mentally/emotionally until you get a chance to recharge by yourself. My favorite reference on being a loner is The Introvert Advantage by Marti Olsen Laney really a fascinating book.
I think the purpose of the group is to just let other loners/introverts know that there is nothing wrong with you, you don't need to change or be more friendly, chatty, get out more, etc. I/we're just another kind of personality. I'm quite happy with myself, spending time by myself, doing what I want to do with my time vs wasting my time doing what some one else might think I should be doing. (Or maybe I'm just selfish, lol) Luckily, I'm married to an extrovert who gets to be the "front man". He gets to do all the phone conversations, answers the door, deals with people I don't want to deal with. I do have family, and many close friends that I can have fun with in small groups, so it's not as if I'm languishing away in misery, in a dark room somewhere.
That's my take on it.......