I received really heartfelt (to me) and sincere life advice on 4chan. I think the fact that it's anonymous without a real karma/voting system means there's a lot less ego-driven, self-centered posting. People don't try to attack as much or have bitter back-and-forths as much as twitter, reddit. They might argue for a bit and then just say f it and move on. But there's no motivation for ragebait, karma farming like there is on twitter.
It's not just that there's no voting system it's that there's no names. It's pointless to argue on a site like Reddit, but it's ridiculous to argue back and forth on a site like 4chan where you can't even know if you're arguing with the same person from post to post.
Likewise an outside observer can't assign any identity to a series of posts in an argument, so you really have to take every post at face value.