We've actually done a few things to try to deal with those issues. We don't have any "default" communities or a universal front page or anything like that, because we believe that does lead to a lot of low quality conversations and groupthink. Instead, you only join communities you specifically opt into, and hopefully that way each community only has people who are actually passionate about those topics and discussions become more in depth and informed.

(Cofounder here, btw, happy to answer any of your questions.)

Edit: I just converted over from being a lurker and created my account to respond here, and apparently I'm commenting too fast. I'll respond to other comments when I can, sorry. :/ Feel free to email me at [email protected] if you want to talk more though!