Garfinkel, Simson L. Wikipedia and the Meaning of Truth: Why the online encyclopedia's epistemology should worry those who care about traditional notions of accuracy. Technology Review. November/December 2008.
--"On Wikipedia, objective truth isn't all that important, actually. What makes a fact or statement fit for inclusion is that it appeared in some other publication--ideally, one that is in English and is available free online. "The threshold for inclusion in Wikipedia is verifiability, not truth," states Wikipedia's official policy on the subject."
--"Consider the verifiability policy. Wikipedia considers the "most reliable sources" to be "peer-reviewed journals and books published in university presses," followed by "university-level textbooks," then magazines, journals, "books published by respected publishing houses," and finally "mainstream newspapers" (but not the opinion pages of newspapers)."
--"So what is Truth? According to Wikipedia's entry on the subject, "the term has no single definition about which the majority of professional philosophers and scholars agree." But in practice, Wikipedia's standard for inclusion has become its de facto standard for truth, and since Wikipedia is the most widely read online reference on the planet, it's the standard of truth that most people are implicitly using when they type a search term into Google or Yahoo. On Wikipedia, truth is received truth: the consensus view of a subject."
Do your students use Wikipedia? Do your students have the skills to be able to use this "verifying" sources to evaluate an articles truthiness?