Comment by schneems
> The entire world was talking about the same thing.
What you’re describing is an echo chamber. Which is what most sites optimize to produce (when optimizing for engagement and). I switch between bsky where it frequently feels that way “everyone is talking about Y” and mastodon where the chronological timeline makes it clear that a lot of people might be talking about it, but they’re also talking about other things.
I feel that one of the most broken things about our current reality (with so many social sites) is that it feels so singular and shared, but turns out that’s not the case at all. My partner and I have started to use the phrase “my internet” to refer to the general vibe we are taking in as in “is your internet talking about scandal Z?” I’m frequently surprised stuff that totally flys under their radar (and vice versa).
I think you're conflating the idea of "shared culture" with "isolation from other social groups". We used to have more friends at the same time as we had more shared context thanks to media distribution patterns.