Describes online misinformation: incomplete, out-of-date, biased information; pranks; contradictions; improperly translated data; software incompatibilities; unauthorized revisions; factual errors; and scholarly misconduct. Suggests online searchers should be skeptical, establish prior knowledge, distinguish between fact and opinion, evaluate arguments, compare related information from different sources, evaluate source reliability, identify bias, learn the conventions of the Internet, and examine assumptions. (PEN)