Hello Hype is a site that the "reviewer" in me just loves. This is a place where people can leave micro (short) reviews on their favorite books, movies, or music. After looking at it, I feel that it does have potential to be a nice tool for students to use to increase their writing skills on topics they might feel more comfortable about.
I recommend giving Hello Hype a try by clicking here.
For a more detailed review check out Larry Ferlazzo's blog.