Academia.Edu has launched a new publishing venture called Academia Letters. Their promotional email describes it as an:
"...experimental online journal called Academia Letters. We're looking for ultra-short research papers (800-1600 words), such as brief reports, case studies, or “orphaned” findings and ideas dropped from previously-published work. Letters are rapidly vetted by scholars researching similar topics. Accepted submissions are assigned a DOI and disseminated to thousands of interested scholars, practitioners, and members of the general public."
More info can be found here:
https://www.academia.edu/letters/submissions/newHowever, you have to be a member (even at the free level) at Academia.edu to see it.