An echo chamber is bad because it not only repeatedly re-broadcasts beliefs, it also amplifies them. "The President is wrong and should be voted out of office" can turn into "The President is wrong and ought to be shot" in an echo chamber environment much faster if there's nobody around to say "wait, hold up, maybe don't."
[Nolan 2010]: https://en.wikipedia.org/wiki/Inception
P.S. Sorry... couldn't resist ;)
Note this is NOT shooting out facts, not necessarily a close individual who you've built repoire with, and in fact almost zero talking. AND it persists for at least 3 months!
It's small, but it's also viable and completely different than what most people I know think of when we go out to "change someone's mind."
Are you implying that social media created Donald Trump?
My friends and I can change each other's minds quite often, by approaching arguments from their own rubric. For example, by drawing an analogy between the topic of discussion and one of their deeply held views, exposing some dissonance.
But it takes time, empathy, and understanding. Which is to say I doubt it ever happens on the internet.
It helps that I'm not employed in software engineering, so I have a degree of humility. Well, a little.
The rules are: Don't believe anything that isn't substantiated, Do be open to new ideas, but don't be afraid to question them, and don't be afraid to re-evaluate your position. After all, your ideas deserve as much skepticism as anybody else's.
That's like saying someone who comes up with a bunch of scientific hypotheses and never tests them should have more confidence in them than someone who does. Holding on to your beliefs even in the face of evidence/arguments to the contrary is not a sign of having better or more considered beliefs, it's a sign of arrogance. If you truly think that you're never wrong about anything so there is no reason to even look for contrary data, that is especially arrogant.
Rational arguments, a bit of rhetorical ability, and persistence are surprisingly effective. The problem is the persistence part requires multiple interactions over months or years, so it's hard to study.
You won't charge their mind, but maybe you won't see each other in such negative light for what each person believes.
Sure those changes are generational as people don't get their opinion changed easily.
But allowing these discussion to take place freely especially amongst the youth is essential to let them shape their world.
So you want to change someone's opinion, but not going to allow someone to change yours?