Wikipedia: Got Truth?

A few of us were talking about the amazing phenomenon of Wikipedia, the comprehensive, peoples' encyclopedia, that anybody can help to write. One voiced his concern that since participants can change entries to reflect their own opinionated positions on any controversial topic, eventually few sites would be credible. I said that school textbooks also reflect prejudices and world views of the people in power and the popular perspective of their time and place. My friend said that ideally you'd like people who are actually from a specific community to write the entries about their reality. I pointed out that physical communities are frequently the greatest practitioners of self deception particularly when they feel threatened by the community "on the other side." So where you gonna go for "truth?"