Oh, man it's been ages. I'm talking being in high school and having teachers talk to me about this. And then being in uni and having it be a thing people argued about.

I do not have any of the papers on hand or even remember the authors or names. The idea that algorithmic searches would create a bubble of self-selected media and erode a sense of shared reality isn't new, though. We're talking mid-90s here. People were arguing this about Altavista.