session 4- wikis

I like the idea of incorporating wikis into my curriculum. I was looking through a wiki called "pay it forward" by Arapahoe HS which asks for ideas to the general audience how give can give back to the community. I can use something like this when I'm covering global warming topic. I can have students ask the general audience for input as to how we should improve global warming conditions. What are some measures that can be taken to lessen the effects and consequences of global warming.
I also like the idea of wiki to have students reflect on specific topics. Perhaps I can use it as a class journal where students can offer the ideas on debatable topics like cloning, stem cell research, etc.