Everyone can use a blog to express your ideas and thoughts on any subject. A blog gives us time to think about an idea and you can make comments on a blog. The ideas are viewed as each ones opinion but the wikis can and will recieve correction and it tends to contain critizism. The author of a book gets the opinions and ideas of a student who can help the author write the book. This can be helpful and the student has a hand in creating or collaborating in writing a book.