06/25/2017
A recent posting to the blog of the Council of Science Editors (CSE) sought consensus on whether research results disclosed in a personal blog constituted duplicate publication. The answer is more complex than one might think...
The core to be understood: it is ethical practice that research results should only be published ONCE.
Duplicate publication* (also known as redundant publication" is the publishing (i.e., "making public") of essentially the same research results in two or more outlets--journals, books, blogs, preprints, open access archives, etc. This unethical practice originates with authors who deliberately seek to pad their publication lists for tenure, promotion, or other professional recognition.
A variation of duplicate publication is aptly termed "salami science": publishing in separate papers the research results that should appear related and together in one report of those results.
Duplicate publication and salami science are unethical for a number of reasons. First, the practice makes the body of scientific knowledge more difficult to integrate and follow (more time is needed for literature searches and reviews!). Next, it squanders resources: properly peer reviewed and edited manuscripts receive considerable value added before publication; retractions or notifications must be published subsequent to a duplicate publication. Finally, inflating citation metrics misleads other researchers, editors, and publishers by giving more importance to a result than is warranted.
Knowledgeable authors, editors, peer reviewers, and publishers recognize their respective responsibilities toward duplicate publication. At each step in the publication process, manuscripts are vetted: ultimately, the authors will suffer if they are reputed to practice duplicate publication.
*For more information see CSE, Scientific Style and Format, 8th ed., 2014, Sec. 2.4., p. 15-17.