Your rank summarizes your activity and popularity on Picsity. Among several things, it is based on the number of things you share and collect, the number of followers you have, and the number of comments you make. The max rank is 100.
Engage with Picsity to raise your rank. Your rank will affect the exposure your profile and items will receive around the site. The higher your rank, the higher the things you share will show up on the site.