A blog can be used as a primary source for information, especially if the blogger is an expert in the field. A blogger’s credibility and authority can lend weight to a particular argument or perspective, increasing the likelihood that readers will take what the blogger has to say seriously.
Additionally, a blogger’s personal experience and observations can provide valuable insights that are difficult to obtain from other sources.
However, a blog should not be relied upon as the only source of information on a given subject. A responsible blogger will clearly label any information found on their site as such, and will also link to other credible resources when possible.
Additionally, readers should always verify information found on a blog before relying on it as fact.