Well he's probably a bit old for Big Brothers...
But socially can I recommend a bar or music scene? I know it sounds weird but for the last 15 years or so those have been my biggest sources of community. Lots of people go the route of church or sports, but neither were a good fit for me.
In a bar community, its ok to be a non-alcohol drinker (odd as that may sound) and because so many people are drinkers, a little bit of social awkwardness it easily overlooked.
In the underground punk-rock community (at least the one's I know) a lot of people are socially... weird. Lots of people who I suspect are on some sort of spectrum or whatnot, lots of lovely people with socially deviant ideas or off the grid political ideas, etc. In fact I was recently interviewed by an NPR program Dispatches from the Underground and asked "why punk rock?" and my answer was " the punk community lets you let your freak flag fly, lots of social groups want conformity, in punk rock you can be who you are."