Interesting! I was in a fannish community from 2007 to 2014 (for due South). It wasn't a large fandom compared to the big ones, but it was a friendly and tightly-knit place and provided plenty of fannish interaction. And I do miss that kind of community! I've realized afterwards how lucky I was, because even if you're in a large fandom, it's not a given that you will find that sense of community.

And now I seem to be in a fandom of (currently) three, which after all is better than a fandom of one. : )

I do take your meaning though that the shared way of relating to stories, even without shared fandoms, can still create a sense of community.