The way I've described scuttlebutt to folks is that it's "what if Facebook felt like Usenet in the 90s".
...Until the voat/the_donald/conspiracy/incels crowd ruins it within a few weeks of it gaining any momentum.
Every bubble other than the own is unpleasant. Social networks need to reproduce the filters we create in real life (social, territorial, etc.) to represent human interaction.
Facebook is sometimes famously called out for creating those filters. ... although I often struggle to unfollow unpleasant (stupid/hateful/hivemind/low effort) content fast enough.