Even though rich sets of quality assessment frameworks, tools, dimensions and indicators for evaluating other types of website are relatively available, there are still no specific quality assessment criteria or indicators for evaluating the quality of blogs since blogs are unique from websites; they provide regularly updated information and personal comments about a particular topic. Only few studies have been conducted on blog evaluation. Some existing research studies focus on the quality of blog content or information, using information quality dimension to assess the quality of content. For example, Kargar; et al. (2008) introduced a framework for evaluating the quality of information on blogs. However, for users of social media, content quality assessment alone is not enough to determine the quality of blogs since blogs are user-generated content. Researchers also used credibility as a metric to evaluate a blog content credibility and overall credibility. Sriphaew, Takamura & Okumura (2008) used credibility indicators as clues for identifying “cool blogs,” i.e. blogs with interesting or noteworthy contents. Several previous studies used link analysis, which assumes that a blog with a reasonable amount of links has a high quality (Shen; et al., 2008; Bihun; et al., 2005). Moreover, usability is vital for evaluating the quality of websites; however, no prior work has been conducted on the usability of blogs. As can be seen, there are no specific criteria or indicators for evaluating the quality of blogs, previous studies used only minimal criteria, such as credibility and information quality, to evaluate blogs.