I think the "small community" thing also happens here on SR... people who tend to relate to each-others problems, thinking style, personality, and/or are drawn to each-other based on shared interests in terms of recovery or otherwise.
I never ended up getting involved in AA much, but probably I would have used a similar approach eventually. I think it's a bit of a personality feature, some people are happiest with a large and extensive social circle, others prefer 1:1 or smaller groups and getting to know some people deeply.
I'm really glad to see things are going so well for you, Nuu!
