Basically, 의해 being an active member of a club and contributing things which others like: 1. Getting the links, articles, 이미지 and 비디오 you've added fanned 2. Answering lots of questions, 투표 etc. 3. It's easier to get medals in 더 많이 active clubs than dormant ones.
I don't think there's a set number of 팬 또는 contributions. The system's pretty random. Sometimes it doesn't really make sense.
