thanks for sharing my opinion about retention on hive
Was confused when reading the begin of that sentence. Haha :p
I wasn't around when there were no communities but I definitely agree that these are kind of an implicit must-have of hive! These really help me to stay active for sure! The support I get in those communities is awesome.
Every now and then, I try to interact with introduction posts and it's usually my advice: check out the different communities and find some in line with your interests.