In many of the classes I teach, I point out how important it is to evaluate a Web site for things such as credibility, timeliness, authority, etc.
I just came across this article that points out that not only students have this problem.
A prominent Chinese newspaper got caught a few years ago publishing an article from theonion.com, which offers news parodies, and publishing it as fact.
Story on the mistake
The original Onion story that prompted the Chinese story