How Does a 2nd Grade Teacher Use a Wiki?

As I review the different links on http://webloggedlinks.pbwiki.com/Wikis I find that I have a difficult time maneuvering through some of the sites.  I click on Using Wikis in Education, thinking I will find information on how to use a Wiki in my classroom, but instead find information on iphones, advertising, blogs, newspapers, etc.  While I like the concept of using a Wiki, I would first like to see how an elementary school teacher uses the concept.  Many of the Wikis available to review were directed to high school students, college students or other adults.  I’m not sure how to utilize a Wiki with younger students.  I think about how my students are just beginning to learn to type and how some of my students get most of their computer  (with internet) access at school.  There seems to be a lot of clicking on links and moving around a site, and I’m not sure I’m prepared to introduce this concept to my second graders.  For a high school student I think Wikis for class would be very beneficial.  Students would be able to answer questions and use the site as a resource.   Any ideas on where I can view a Wiki for elementary (primary) students.