Wikis

When I first found out about Wikipedia I thought it was the coolest thing because it allowed anybody to correct wrong information or to add on incomplete information. I have used it since then and I have never been led astray by it; therefore, I can see the importance and help that it provides in that occasion, but looking at all the libraries using Wikis, it didn't seem very useful to me. You still need a password to change or add on anything, so unless you are part of that library staff you can't do anything. And even if you did it's probably so heavily monitored that everything would be censured. So how does it help the patrons?