Wikipedia As An Example of Spontaneous Order
Jimmy Wales invented Wikipedia (it currently has 1.6 million articles in English), and he remains its reigning local deity. Despite that, Wikipedia actually happened because it was allowed to happen. Rather than specifying at the beginning what the rules would be, Wales let the community evolve its own rules, in response to real needs.
From the current issue of Wired Magazine, "Wikipedia Is Just the Start: An Interview With Jimmy Wales"
See the entry for "spontaneous order" on Wikipedia.