I posted a highly-upvoted answer on Skeptics Stack Exchange based upon numerous Chronicling America database newspaper quotations, and chatted in comments about this with a psychology professor.
The professor, listing himself as sole author, then submitted an article with highly overlapping content to a peer reviewed journal, without any citation to my Stack Exchange answer.
(More specifically, in Stack Exchange comments, I criticized a specific 2012 paper of the professor, which was primarily based upon google book ngrams, and showed in my answer numerous quotations from the Chronicling America database that result in a different conclusion. The professor then submitted an update of his 2012 paper to the same journal adding numerous quotations from the Chronicling America database.)
Is this ethical? I've only published in chemistry/biochemistry journals and don't have any idea what is typical for psychology journals.