Probably not quite what you're looking for but there was an interesting social network where the posts were forced into a kind of logical structure. For example

Probably not quite what you're looking for but there was an interesting social network where the posts were forced into a kind of logical structure. For example, if you posted a conjecture you had to list supporting points that had to be individual. Then if someone wanted to reply to any point, they had to address that point specifically. I can't remember it's name and am totally unsure of how successful it was at staying on principle. But it was an interesting idea.