StumbleRank has nothing to do or has no competiton with Google PageRank, except for the fact that both are toolbar based and reach millions of users.
StumbleUpon, StumbleRank, Ranking, Social Media, Social Networking
StumbleRank lets users add any Stumbler to their database and then keeps track of the stats of those users, updating twice a day to create an accurate list of the top 100 stumblers and their stats.
StumbleRank, rank users for fun and competition. You can check out the list to see who the movers and shakers are on the best and most fun socially driven site around. And make new friends while you're at it! Please keep in mind that you need to add yourself (use your username not the entire url) before you are indexed in the database and can be compared to other users. (Rankings updated every 12 hours)
Users of StumbleRank can sort the stumbler rankings by any of their activity, pages, photos, videos, fans, and reviews; depending on what criteria is most important to them.