One of the questions that I am asked on a fairly frequent basis is, "should I create a blog, a wiki, or a website for my classroom?" Each platform serves a slightly different purpose. Years ago I created a small set of slides to outline the features of each platform. Yesterday, I rediscovered those slides and found that they are still useful. I have embedded them below.
My friends at Common Craft also have some good explanations of blogs and wikis. You can see those videos below.