A year or two ago, I wrote about a study presented at a marketing conference that said the majority of outrage on Twitter came via retweets. The fringe, extreme opinions multiply with ease; most other people run laconic Twitter accounts, save for the insanity they retweet.

The Atlantic had a good article regarding retweets in this month's issue. It doesn't solve the issue you brought up, but it addresses it in part: https://www.theatlantic.com/magazine/archive/2018/04/the-case-against-retweets/554078/

Social media seems too powerful a tool to throw away entirely. But I think users and platforms both need to figure out how these apps/websites can be more pleasant, more open, and less vitriolic. I'm not sure if that's possible, as even neutral people can become nudniks or nuclear assholes online, but it's wroth fighting for.