In the past I've talked about the nerd club pattern.

It's an optional/secret group that allows a diverse group of people to choose to talk about whatever they want.

This means that the threads that people choose to participate in are ones they find interesting.

Interesting: surprising in some way, and potentially useful.

Interesting things spark people's curiosity.

A thread that many different people find interesting is likely to be found interesting in the surrounding context, too.

This is not the case if you have an echo chamber of similar people.

But because you've added people to the club with a "novelty search" over different viewpoints, it gives you a good proxy for how the overall context will find it.

This is why nerd clubs are structurally more likely to find interesting, game-changing ideas.