Let me share with you one of my favourite pages on Wikipedia: https://en.m.wikipedia.org/wiki/List_of_cognitive_biases

Hacker News, sometimes reddit.... IDK of this effect has a name... the graham law maybe?

Once a colleague mentioned it and since then I notice it everywhere :-)

Not OP, but I pretty much only know two effects: Baader–Meinhof effect and Streisand effect. So I guess the answer for knowing this particular one is just that it is famous.

So I guess the answer is that this repertoire grows whenever someone tries to suppress its knowledge.

baader-meinhoff has been a neologism for a long time now, enough so that it isn't really a neoligism anymore, and we just collectively moved onto accepting it as the name of this phenomenon.

there's a lot of these sorts of in-sphere jargon; you'll start picking them up if you peruse the more esoteric threads on tech news blog aggregator sites like this.

like, if one of the original repliers in a thread is "why is this on HN", there's an increased chance imho that you'll run into this sort of techno-cultural salon effect.