Blogs serve different purposes, resulting in several types of blogs. In fact, types of blogs can be classifi ed by several approaches, such as blog purposes, motivations, and blog contents. For example, Nardi; et al. (2004) identifi ed fi ve major blog types: life records, comments, emotion expression, thought clearing, and idea exchange. De Moor & Efi mova (2004) categorized blog posts regarding purposes of blogs (what blog is created for), consisting of four types of blog posts: 1) opinion posts, where a topic is defi ned with related links; 2) vote posts, where bloggers agree or disagree with one another; 3) reaction posts, where a blogger responds to a post on another site; and 4) summation posts, where a blogger summarizes other blogs.