I have changed the annotation for Wikipedia on the Encyclopedias page of the online reference collection. Previously it was a blurb provided by Wikipedia, and consquently, offered no caveats about the dangers of using information from an encyclopedia where anyone may contribute.
The new annotation reads "Wikipedia is a Web-based, multi-language, free-content encyclopedia written collaboratively by volunteers and sponsored by the non-profit Wikimedia Foundation. Users should remember that because anyone may contribute, the information provided may be incorrect, biased, or intentionally misleading. The University Libraries do not recommend using Wikipedia as a source for class assignments or papers."
Kay kindly shared an interesting blog entry in which a professor of English at UC Santa Barbara provides some guidelines on when it is okay for students to cite Wikipedia in their work:
Some professors might wish the Web site's name never turned up in students' papers, but Mr. Liu argues that Wikipedia can be a useful, if limited source:
"Wikipedia citation can be an appropriate convenience when the point being supported is minor, noncontroversial, or also supported by other evidence. In addition, Wikipedia is an appropriate source for some extremely recent topics (especially in popular culture or technology) for which it provides the sole or best available synthetic, analytical, or historical discussion."
But that should be about the extent of it, Mr. Liu suggests. Wikipedia should never be used as the primary source for information on "anything that is central to an argument, complex, or controversial," he says.
And he makes a good point about the ephemerality of the site: Since articles are continually contested and changed, citing a Wikipedia entry without noting the date on which it was viewed is "meaningless," he argues.