The Baader-Meinhof Phenomenon

This is a strange Wiki Wednesday entry in that it no longer has a Wiki page, for the fourth time. But what is it?

Well, it's a term you will now hear in the future, despite not having heard of or known of it until now. Baader-Meinhof is just that. You learn a bit of obscure knowledge, and then it seems that you see it everywhere. For example, someone in one of the very few countries where my blog is not read mentions Insanislupus' Anti-Social Club, which, since you obviously live in a cave, is an obscure reference. The following day, another of your cave-dwelling friends mention Insanislupus' Anti-Social Club, as if it was never an obscure bit of knowledge. Now this person could not have learned about it from the same source, or it doesn't count. 

And then come all the cognitive biases, none of which directly fit or apply here, try as they might, to cover something interesting up and make light of an inconsistency in our consciousness (They Live). You'll see a lot of comment geniuses with their BS about how this is similar to blah blah, i.e. it's not the same fucking thing. I completely understand why it was deleted from Wikipedia, oh, wait, no, I don't because there should be a big warning explaining that it needs credible sources. I doubt that Baader-Meinhof is a technical term, being as I have studied cognitive biases to death and have never seen it listed in a textbook, but the moment I learned about, it popped up a few times here and there. I research every term with the word phenomenon behind it, so it's unlikely I would have seen it before and disregarded it. 

The Damn Interesting Article That Tries To Explain It
Wiki (The Internet Never Forgets, Reptilians!)
A Really Long and Mildly Interesting Moderator Discussion Over the Term