I know of some people who only talk to the houses directly around them. The "neighborhood" to them is the 1 house distance square around um. Sometimes even then its hard to get the 9 households together for a cookout or the impossible lets talk about preparing for the worst meetings.
You would be surpised on how most communities pulls together in the face of a adverse situation whether on a small or large scale. Over the years, I have personally been both the recepient of my neighborhood's (including many we had never met) generosity and I have also been on the giving side of generosity when others needed help.
To use the neighborhood wireless network as an analogy in a hypthetical situation. I don't think there is one member on this forum who if by chance had the requisite computers and access to the internet during or in the aftermath of said hypothetical situation would refuse any good neighbor who did not have a computer, reasonable access to their computer and internet access.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock