Actually, I have noticed recently that several online communities are approximating what I used to think of as a "BBS".

I think, specifically, of the lesswrong site and the collection of tools and user-created content that are collected under a single site there.

^ brings back some memories. The WELL was the first social-internet thing I ever heard of -- in a TIME magazine cover story on, I kid you not, 'Cyberpunk' -- circa 1993ish