Thanks for putting this together Brent. Definitely some sources for me to explore that I hadn’t known about. Just to help you fill in on some additional parts of the picture:
• Linda Ceriello’s and my site https://whatismetamodern.com was started in 2013.
• Perhaps this 2018 Medium article by me should be included:
https://medium.com/what-is-metamodern/after-postmodernism-eleven-metamodern-methods-in-the-arts-767f7b646cae
• Linda C. Ceriello and I wrote this chapter “The Right to a Narrative: Metamodernism, Paranormal Horror, and Agency in The Cabin in the Woods” in the book The Paranormal and Popular Culture: A Postmodern Landscape (Edited by Darryl Caterine and John W. Morehouse, 2019).
• I don’t see Timotheus Vermeulen and Robin van den Akker’s seminal 2010 “Notes on Metamodernism” article. It comes before and stands apart from their web site, also called Notes on Metamodernism, which I do see in the spreadsheet.
https://www.tandfonline.com/doi/full/10.3402/jac.v2i0.5677
Timotheus Vermeulen & Robin van den Akker (2010) Notes on metamodernism, Journal of Aesthetics & Culture, 2:1