here are some posts about online communities that I find very good for one reason or another
(Not a full list, no particular order, mostly from the running list we keep at @capiche. screenshots in this thread are their quotes, not my notes)
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My notes from Hackers & Painters by Paul Graham:
The way to create something beautiful is often to make subtle tweaks to something that already exists, or to combine existing ideas in a slightly new way.
There are only two things you have to know about business: build something users... See more