Adopted by the Journal of Cheminformatics (Aug 2020)
Adoption announced, editorial by Egon Willighagen
Blog post by Willighagen on the same subject
CiTO updates (another blog post by WIllighagen)
BioMedCentral on the CiTO Pilot (seems to only include Journal of Cheminformatics, for now).
Usage of CiTO is spreading. This page keeps track of CiTO annotation in Wikidata.
What about adoption by tools?
Willighagen offers rudimental instructions for BibTeX (but probably only suitable for Journal of Cheminformatics at the moment) as well as for Google Docs + Zotero (not really working) in this github repo.
Markdown template with CiTO for the Journal of Cheminformatics.
The best tool with support for CiTO: pandoc scholar
Pandoc Scholar appears to be our best bet at the moment if we want to use CiTO in our manuscripts.
Krewinkel A, Winkler R. 2017. Formatting Open Science: agilely creating multiple document formats for academic manuscripts with Pandoc Scholar. PeerJ Computer Science 3:e112 https://doi.org/10.7717/peerj-cs.112
It looks like support for CiTO should happen at the document processing tool stage, and not in our reference managers (Zotero, etc.).
I wonder if something like Biber/BibLaTeX should add support for CiTO, or if that's the wrong abstraction level.
Martin Fenner has a blog post from 2011 (Google Cache) where he shows how to use CiTO with a Wordpress plugin, unfortunately both the post and the plugin appear to have gone offline.
Recently, ORCID promoted Scite_ on their blog. But Scite describes itself as a Brooklyn-based startup (I assume that's code for venture capital-backed), although it also acknowledges funding from public institutions such as NSF and NIH. Scite uses "a deep learning model" to identify "citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence" (so they really only classify the citation as supporting or contrasting). In contrast to Scite, CiTO is an open standard that anyone can build on. Although Scite is currently much glitzier and fancier than anything CiTO can provide, we should encourage everyone to use CiTO (if they care about citation classification).