Using 'Wikis' in ELL

Using 'wiki' is a very popular approach to online community development. According to Cunningham (2001), wiki is a freely expandable collection of interlinked webpages, where each page is easily edited by any user. Different contents can be linked to other wikis or Web documents.
As I have understood, one of the good opportunities that wikis give the instructors, is that they can create interactive activities for their students. From my own experience I can say that wikis mainly develop the learners' reading and writing skills. When one of the students posts a content according to a specific instruction, and the other has to continue the previous student's piece of writing, it mainly affects on their critical reading and writing skills. While reading the students have to continue their thoughts based on the other students' writings. I want to mention that in wikis the writing process is asynchronous, i.e. the writing cannot be done simultaneously by different students. It also creates coherence in their writing, because they have to use words of coherence so as to better connect their ideas to their coursemate's ideas. So, using wikis can be a good tool for developing the students' language proficiency, in terms of reading and writing skills, besides for creating a good sense of collaboration and interactive work.