Members are invited into campaigns and sent free products to try. Members then need to BZZZ or in other words talk to other people about their experiences with the product. It is called word of mouth advertising. I had complained since I became a new member that I got very few campaigns, hence found it hard to "level up" into the preferred status where one could get more campaigns, presently though I am in various stages of 5 different campaigns so at that moment hanging in with the frustration of few invites over the first couple years seems to be paying off. We';; see if it contunues in this manner.