Week 7 : #16 Learn about wikis

I am still not sold on the advantages of using wikis. I can see where they would be useful when a group is collaborating on a particular project. My issue with them is the whole control or lack of control. I still don't see why one would use Wikipedia which can be edited rather than a standard credible encyclopedia although we have been referred to articles in Wikipedia frequently throughout these activities. I noticed that at St. Joseph County Public Library's subject guide wiki only librarians have the ability to edit the entries which I can agree with but than doesn't that defeat the purpose of having it as a wiki ??? I'm not ready to jump on the wiki train just yet.