Wiki-ternatives
Way back when, before the Internet, there used to be a hierarchy of information sources. When you had to write a high school term paper, for example, you would work your way through the various information sources - teacher, librarian, library book, Cliff's Notes - until you reached the highest authority of all; The Encyclopedia.
You wouldn't expect an encyclopedia - which is supposed to be a record of factual information on a broad range of topics - to generate too much controversy. After all, facts are facts, and either they're right or they're wrong. At Wikipedia, anybody can register to edit an article on any topic, and the idea is to keep the flow of knowledge as unfettered as possible. If a fact is in error, Sanger says, the theory is that the community will be self-policing, and that errors will eventually get fixed by somebody who knows the score.