A broad new survey of Wikipedia users found that only 13% of the online encyclopedia's contributors are women.

The November survey, which had some 175,000 valid responses, was conducted in multiple languages by the Wikimedia Foundation, the nonprofit that operates the site, and United Nations University's tech-research program MERIT. They presented the initial findings last week at Wikimania, an annual conference held this year in Buenos Aires. A comprehensive report is scheduled for November.

Of...