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FWIW, the book The Identity Trap by Yasha Mounk attributes the popularisation of what it calls the Identity Synthesis to social media such as Tumblr, then later Reddit, Twitter, Instagram; and web sites such as Thought Catalog, later Jezebel, xoJane, Rookie Mag, and the Daily Dot, then everydayfeminism.com, Salon, Vox. I think it's conceivable that, while these ideas on the left and right later entered all social media and even mainstream media, they originated on Tumblr and 4chan, respectively. I wonder whether one could quantify/measure it somehow. |
You could probably use something like genetic tracing, if you could come up with a way of fingerprinting free text semi-reliably.
My expectation is there are probably "tell words" (i.e. not used elsewhere or for that purpose) in novel ideas, and you could likely observe these spreading over time, as the ideas carrying them did.
One of the first things groups tend to do is specialize and redefine language / create jargon.