> Maybe a social network that prioritizes high-quality content rather than fresh content. High-quality content (in terms of being e.g. persuasive & informative) may have a better chance of creating positive change than one's typical posts..

One could argue this exists in some way through forums that rank posts through a voting system like HN or Reddit, so my question would be around what would a “2.0” version of this sort of forum look like? How can good behavior be incentivized, I.e positing high quality, original content without allowing older top posts from being reposted by spam bots in order to karma farm?

Much of what happens on mainstream and default subreddits is bot generated, in the sense that they pick popular things and repost them at optimal times of day for as many upvotes as possible.