Few months back, I created such group with the intent to help fellow minnows and neophytes. It was a group of 20 members who were supposed to follow certain rules of the group. Members could only post once in 3 days and fellow members had to upvote it.Besides, sleeping/nonactive members were to be replaced after 2 weeks with new members. Unfortunately, due to unknown reasons that group couldn't prosper as expected and ultimately I deleted it.