It is a group with the same hobby (i.e. buying silver and gold coins aka stacking) and we post in tag steemsilvergold and become official members of the club and (some of the IT lovers) set up a club bidbot whereto we delegate steempower agaisnt a daily upvote (max 1 ) n your post. It is to optimally milk the system and to have fun as well. There are a few others liek us here doing the same or maybe many.