I'd love to see literally any data that this "echo chamber" thing is real. A lot of people on lemmy in particular love to talk about it but in a vacuum, without any reference to what they mean by it.
A while ago on lemmy I stated a political position and someone told me "If you ever talk to anybody outside of your echo chamber you're in for a dangerous time", and I was like, okay, I'm talking to you, right now. Hit me with this dangerous knowledge. No reply. The whole time they talked to me the only thing they had to say was about echo chambers and no actual, substantial reply to anything I was saying.
So if anyone wants to explain what they actually mean by this concept with details and evidence I would love to hear it.
I'm doing it. I'm stepping out of my echo chamber and ready to hear the unvarnished truth from you brave iconoclasts. Oh god this is scary.