Why is it significant?

Because blogs engage people in knowledge sharing, reflection, and debate, they often attract a large and dedicated readership.
Blogs are becoming an important component of the Internet landscape, providing authors and readers with an avenue for unedited expression, reaction, and connection, without the censorship of mediated chat rooms or formal media outlets.
The simplicity of creating and maintaining blogs means that open discussions can be established almost immediately, making blogs an ideal venue for far-reaching discussions among the Internet community on new or timely topics. Blogs foster the growth of communities, and the dynamics of collaborative filtering and recommending/referring may provide new ways to evaluate, vet, and critique student-created knowledge.