A good description of "common knowledge."

[BobTheSubgenius]

"But if you really think about what you really actually know, it’s only a few things, like seven things, maybe everybody knows. The rest are just patterns you call a life. And… If you actually made a column of things you’re pretty sure you know for sure, and then made another column of how you know those things, most of that column is like, “Some guy told me.”

You know, it’s not sourced material, it’s just– it’s clickbait and hearsay, that’s all. Goes into the head, locks onto a feeling, you’re like, “That sounds good. I’m gonna tell other people that.” And that’s how brand marketing works...and also fascism, we’re finding." - Marc Maron