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https://nextdoor.com/ seems to filling that niche pretty well in my neighborhood; almost all my co-workers who own a house use it as well.

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It's definitely a step in the right direction and fulfills the neighborhood aspect. I have a different idea in mind for what I'm building; I want to see a participative economy built from the ground up.

Something like http://timebanks.org/?

Yes, but with a democratically generated currency to collaboratively benefit the community.

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