Contributors to Wikipedia have wondered aloud lately if — perish the thought — they are running out of topics. The obvious articles, low-hanging fruit like “China,” “Moses” and “Homer Simpson,” have been written and rewritten hundreds of times. There are more than 2.8 million articles on the English version of Wikipedia alone. Already looking back, Wikipedia this month got its first serious memoir, “The Wikipedia Revolution,” by Andrew Lih, an early Wikipedian (yes, that is what they call themselves), who writes about how “a bunch of nobodies created the world’s greatest encyclopedia.”
But these concerns seem misplaced — Wikipedia can no more be completed than can New York City, which O. Henry predicted would be “a great place if they ever finish it.” In fact, with its millions of visitors and hundreds of thousands of volunteers, its ever-expanding total of articles and languages spoken, Wikipedia may be the closest thing to a metropolis yet seen online.