Plink Ploink Plonk

In another newsgroup, a man who was killfiled complained about the spelling. He was ploinked, and he apparently wanted to be plonked instead. A third party replied that the ploinking lady wished to emphasize the oink. I became curious about the etymologies of "plink," "ploink," and "plonk" meaning to killfile someone.

Perhaps "plonk" relates to the sound the computer makes when killfiling someone. My computer doesn't make that sound, but maybe some computers do (or did). Perhaps "plonk" relates to the sound of a wadded paper when it hits the circular file, and metaphorically to the sound of a fool hitting the bozo bin.
"Plink" and "ploink" are derived from "plonk." They each have different sounds, and it's the sound that's important. Perhaps "ploink" is more personal. The person being killfiled hits the trash bin and squeals like a pig.
"Plonk" was not originally an acronym, but some people have devised acronyms for the word:
Person Leaving Our Newsgroup Killfiled
Person Leaving Our Newsgroup Knowingly
Put Lamer ON Killfile.
Person with Little Or No Knowledge
First Use
Richard Sexton was the first person to use the word "plonk". He was responding to a post in talk.bizarre (which may have been crossposted to alt.flame), and which has since been removed from the archives. Sexton's alt.flame post, dated November 11, 1989, was in a thread entitled Nuevo Chico.

QUOTE
[nq:2]Please refrain from posting to talk.bizarre until such time as ... or some similar group where your fellow mental defectives congregate.[/nq]
[nq:1]Make me.[/nq]
plonk
This article was made from the finest quality words and sentances. Minor imperfections in syntax, like the grain in fine leather, serve to enhance it's beauty. (Email Removed) {routing site} !gryphon!richard
END QUOTE
Second Use
Five days after the first use of plonk, Sexton used it again in alt.flame. His November 16, 1989 post was in a thread entitled This is fun, isn't it.
From http://snipurl.com/Plonk2
QUOTE
You're right.
plonk
(Would you do me a favour and put ``PSU'' somewhere in the header of your articles so my kill file can weed you out in 1 pass, instead of 2 ? Thanks)
"He is good with numbers, but I keep having to tell him how to work the VCR over and over again'' Rajan Mahadevan's roommate (Email Removed) {routing site}!gryphon!richard

END QUOTE
After I found the Sexton messages, I found a thread in talk.bizarre about the origin of "plonk".
Mark Barratt explained what it's like to be killfiled.
Apparently people had newsreaders as early as 1989 which were sophisticated enough to have killfiles. Does anyone remember that? Thank you for your time.

Mike Bandy