Blogs are good for archiving content--whether the original posts or comments. Even if people don't make many comments (which often happens), blogs can facilitate such discussion.
Wikis are better for on-the-fly edits and can be useful in teaching. For example, rather than giving out a paper handout you can make a wiki page the "handout" and update it instantly based on feedback during a class. This does require the instructor to be more flexible than they might be used to.
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