I believe they are tackling this problem from the beginning and making it a big part of the design of the platform:
- Comments require the author to approve for being public. Here most of the trolls are avoided because who would approve a troll comment.
- Responses need to be recommended by the author or someone you are following in order to show up by default (else they are buried under a “Show more responses” button).
- Posts that are not recommended by your network don’t get visibility.
All these work in favour of good content and against trolls, and helps to shape the platform in a better way than others (imho).
Definitely worth emulating where possible.