Here are some links about how Wikipedia works.
And how it sometimes doesn't work. Please read this all the way through. You may have heard me talk in class about the DeFoe stuff, but it's worth reading about.
What happens when "the community" can't agree?
One of the more interesting commenters on Wikipedia is Jason Scott. This is just one of Jason's many posts on WP. The comments -- although they go way, way off topic -- also have some angles worth pursuing.
A lot of Wikipedia critiques seem incredibly ancient by web standards, but I think they still hold true.