The echo chamber effect of these platforms is often called out as a bad thing, but in my opinion it may also be useful as a way of nurturing ideas that would’ve otherwise been squashed early because they’re too contrarian. The problem is, you can only find out whether an idea is good or not by exposing it to an increasingly large audience. And then I guess there’s the risk of allowing “dangerous” ideas to gain such a large following that they’re hard to stop.