The topical interests, general characteristics, experiences and opinions of HN members are too diverse to qualify as a community, IMO. There may be subsets that could qualify as a community, and if you only look at certain kinds/topics of submissions it might feel like one, but they are mixed within a larger heterogeneous crowd here.
I feel that a community can def be heterogenous AF. I participate in exactly that type of (IRL) community, and it is worldwide.
It does require some common focus, and common agreement that the community is important.
I do believe that we have those, here. The "common focus" may not be immediately apparent, but I think everyone here shares a desire to be involved in technology; which can mean a few things, but I'll lay odds that we could find a definition that everyone could agree on.
