I see the term "community" as a group of people who come together who share common interests, struggles and emotions. Is this what you meant?

I tend to call them forums.

So if I'm feeling a little depressed I might pop into the depression forum. If I'm having a bit of a borderline moment I might post in the bpd forum.

And then of course the term community can be used globally. The whole of psychcental is a community where members join and receive support and share stories with others, regardless of what forum they're posting in. We're one big happy family!