Wiki is for anyone in education including teachers, students, and parents. The teachers can create their wiki pages and assign home work to the students, create discussions to get the students opinion. Students and teachers can add and edit the pages. It is a wonderful way to create student centered collaborative learning environment.
Librarians, in case you hadn't heard, are essential members of society -- likely to expand minds wherever they go -- and, as such, are fully worthy of hero worship (whether they're among the coolest librarians alive or just pretty cool).