"Flaming", in the context of online interactions, refers to hostile and rude behavior of one user toward another. More recently the term "trolling" has come to mean similar things, though in my experience "flaming" is more about a particular episode (reasonable users might flame sometimes), while "trolling" is about a pattern of behavior (certain users are trolls). But this question isn't about trolling; I'm interested in the history of flaming.
Wikipedia describes the early history, saying that it arose in the early 1980s and possibly from unnamed east-coast (US) engineering schools. It suggests that the term might originate with the Hacker's Dictionary, published in 1983, but I know from personal experience that the term was in use on the ARPANet at least by 1981. (Also, the Hacker's Dictionary was reactive, describing terms that were already in use, not prescriptive.) I happen to have been a student at an "east-coast engineering school" at the time, but I had the impression that the term came from "outside", on the ARPANet or Usenet -- we didn't originate it.
So my question is: how did this term, and the identification of the behavior it names, come about and spread? Was it a meme that spread gradually, or did somebody high-profile coin the term and everybody started using it, or what? On what networks did it originate?