Should a historian ever use a personal blog post as a secondary source for a research paper? No, blog posts can never be used as secondary sources, even if written by credible authors or posted on acceptable websites such as .gov or .org websites. No, blog posts should not be used as secondary sources because it is difficult to establish the credibility of the authors as they are often biased and do not always use facts. Yes, blog posts can always be used because they are either a primary or secondary source, and credibility concerns are secondary to the type of source. Yes, even if this information is biased, blog posts can be used as primary sources if balanced by facts, reasoned judgments, and analysis by more credible sources.