A wiki page can be set as private or public depending on the purpose of the site. For example, a wiki page can be created for a classroom of graduate students for a collaborative project. One of the most fascinating features is the ability to "tap to edit". As long as the student has access to the site, they can comment or modify information at any time, enabling multiple user participation.
I'm an advocate for this form of education as it tackles a key element in today's modern world; teaching students to build tech skills.. Of course students should still follow appropriate curriculum but we also need to prepare them for the current real world structure. As Mary Bold stated in, "Use of Wikis in Graduate Course Work", The incorporation of web-based interactive wikis, along with the CMS adopted by the University, supports not only our graduate students current course work but also their development as lifelong learners in use of technology. More specifically, students in an online program benefit from what is called a dual education (Haythornthwaite, Kazmer, Robins, & Shoemaker, 2000), mastering online interaction as well as the curriculum."