I think part of it is the lack of voting and the presence of easily-identifiable avatars: participants have an incentive to post things that generate maximum e

I think part of it is the lack of voting and the presence of easily-identifiable avatars: participants have an incentive to post things that generate maximum engagement and discussion with other specific users as opposed to maximum instantaneous agreement. In this regard it mirrors real-world social interaction much more closely than reddit/fb/twitter.