Wikis in the Classroom

I have explored the video clips / information presented about wikis and have thought about its application in my classroom.  I suppose that if I were to have students complete a group project, it would be useful.  Students could work collaboratively without having to physically meet.  However, I see blogging as being more practical in my classroom.  I am more interested in students posting reactions to discussion questions or to a visual and having classmates respond to their posts.