Fashion blogs attract the interest of a large audience of women in search for dressing inspiration. The readers look for suggestions from neatness bloggers with demographic characteristics similar to their own, and who they can trust. The main benefit offered by blogs when compared to the traditional media is the reliability conferred to the blog, since the authors would be free of biases, representing the common consumer. Nevertheless, it is known that a considerable number of bloggers receive gifts and financial income to recommend products in their websites. This phenomenon occurs in two different ways: either the author recognizes the existence of a partnership with the recommended fashion brand, or conceals this partnership. This occurrence has provoked important ethical questions. This study focused on identify if the blog s credibility can be affected when there is evidence that the authors are hiding their connection with the recommended fashion brand. To answer this question, an online experiment with convenience samples resulted in 350 answered questionnaires, from which 157 were valid. It was created a website that, in accord with determination of algorithms, presented two types of blogs: one where the author is favorable to the practice of identifying sponsored posts, and another where the author seeks to hide a link with the brand that is recommended. The experiment compared the average for the theoretical constructs Reliability; Attitude and Intention to Follow Recommendation, which was the only one that presented substantial differences between the averages. The theoretical construct Source Reliability was also measured, indicating that the respondents are not favorable to the presence of propaganda in fashion blogs.