IMAGINE a newspaper with more than 2,000 writers, researchers and copy editors, yet no supervisors or managers to speak of. No deadlines; no meetings to plan coverage; no decisions handed down through a chain of command; no getting up on a desk to lead a toast after a job well done.

It doesn’t sound like any news operation that any journalist would recognize. Yet that seemingly chaotic nonstructure best describes the scene at Wikipedia, the online encyclopedia, which, for a few days last week, served as an essential news source for hundreds of thousands of people on the Internet trying to understand the shootings at Virginia Tech University.

From the contributions of 2,074 editors, at last count, the site created a polished, detailed article on the massacre, with more than 140 separate footnotes, as well as sidebars that profiled the shooter, Seung-Hui Cho, and gave a timeline of the attacks.

According to the foundation that runs the various Wikipedias around the world, there were more than 750,000 visits to the main article on the shootings in its first two days, an average of four visits a second. Even The Roanoke Times, which is published near Blacksburg, Va., where the university is located, noted on Thursday that Wikipedia “has emerged as the clearinghouse for detailed information on the event.”