Wikipedia officially launched; open editing changes the knowledge world
Context: On January 15, 2001, Wikipedia officially launched using wiki technology to allow anyone to edit any page. Initially conceived as a Nupedia supplement, within weeks its article count surpassed Nupedia's two-year output.
Decision: Adopted wiki technology as suggested by Larry Sanger, completely opening editing permissions, eliminating pre-screening, and relying on community self-correction.
Reasoning: Nupedia's failure demonstrated the inefficiency of strict review; wiki technology's low-friction participation threshold could activate large numbers of potential contributors, using quantity advantages to compensate for the absence of quality control.
Outcome: Wikipedia accumulated 20,000 articles in its first year, exceeded 100,000 in three years, and ultimately became one of the world's largest reference sources with over 55 million articles in 60 languages.
Lesson: Radical openness can produce knowledge accumulation speeds faster than any closed expert system; the key is designing good community self-correction incentive mechanisms.
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