Social circles that I strongly identify with:
This IS the most important social circle for me. When shit goes down, we usually have each other's backs. There is so much estrangement from family and employers, that we HAVE to be each other's chosen family. (employment though, that's a harder problem)
The BDSM community is larger than the queer community, so it's less incestual (you don't have to worry quite so much that the next person you're dating, just dated your most recent ex within the last few months) This is very important to me right now, because I'm becoming social for the first time in my life, and I'm making a LOT of mistakes. This lets me spread the mistakes around a little more, and it gives me more opportunity to figure out who I am and what I want.
It's also yet another group where we deal a lot wtih privilege/marginalization, outreach, consent, and what makes a "safe space". Much of our clientelle is low-income, and sometimes low-education, and it's a great place for me to try to deal with my huge mentalism problem.
The anonymity fosters much more frank disclosures than would otherwise occur. The frankness encourages peers to support each other. And members end up being more supportive than blood family, even though they sometimes don't know each other's last names.
One lesson I've learned at 12step groups is that self-honesty is SOOOO important. In 12step groups, it's usually focusing on being honest about how often you get high / act out, and especially about your underlying motivations for getting high / acting out. However, that strong focus on self-honesty has helped me be honest with myself about how queer I am, and has fostered self-acceptance in that area as well.