Basically, oleh being an active member of a club and contributing things which others like: 1. Getting the links, articles, gambar and video you've added fanned 2. Answering lots of questions, poling etc. 3. It's easier to get medali in lebih active klub than dormant ones.
I don't think there's a set number of fan atau contributions. The system's pretty random. Sometimes it doesn't really make sense.