This renders the word "community" meaningless. The essence of a community is that people know and care about each other. People in big cities are, for the most part, just a collection.
I really disagree with this definition. "Care" is way too strong, as is the idea that people must know each other.
You're describing a very small social network. If every person's immediate family and close social network is a "community", then "community" loses all meaning.
Do I care about the other people just in my apartment building? Not above a minimal base level of caring for anyone, apart from a few cute little kids. Do I know anyone else in the building? No, not really, not even the cute little kids. Would I help one of them in an emergency? Sure.
But we are a community in the sense that we have shared interests: that the elevators be kept running, that power be kept on, that the water supply be kept going, that the parking lot be plowed, that the garbage be collected. We may never have cause to work together in support of these shared interests, but the potential exists.
No, a community is a group of humans who share a common interest and therefore gather in some form. This would apply to people who are not interested in direct contact as well, it's what separates them from the rest and makes them a community devoted to that special interest.
There needs to be some connection, not necessarily interaction. Geographic proximity creates communities whether or not they interact, because the members have inherent shared interests. Something may arise that spurs interaction and action in concert. But the community exists already by virtual of residence by the members. It may be latent, but it's there.
Other relations between members are possible as well. Students and faculty at a university, for instance. Or staff and patients at a hospital. Or a regional technology interest group. In these cases, membership in the communities is more tenuous, and is maintained by group participation, enrollment in the university, participation in a hospital treatment program, etc.
Virtual communities such as HN are almost entirely reliant on interaction for establishing membership.
EDIT: can't seem to reply to post below. Here is a second go. A community requires more than shared interests or being gathered together. E.g. people working for the same company are not usually thought of as a community, people living in the same street (in the UK) often can be. A forum or mailing list never can be, people might refer to it as such but that is as desperate as referring to other Facebook users as your "friends".
You're describing a very small social network. If every person's immediate family and close social network is a "community", then "community" loses all meaning.
Do I care about the other people just in my apartment building? Not above a minimal base level of caring for anyone, apart from a few cute little kids. Do I know anyone else in the building? No, not really, not even the cute little kids. Would I help one of them in an emergency? Sure.
But we are a community in the sense that we have shared interests: that the elevators be kept running, that power be kept on, that the water supply be kept going, that the parking lot be plowed, that the garbage be collected. We may never have cause to work together in support of these shared interests, but the potential exists.