Whats the best way to be come a power stumbler. Do you have to find new sites or just stumble and "thumbs up" a site.
If you mean becoming one of the "Most Popular" stumblers, you need to find, review, thumb up/down, many hundreds or thousands of pages and content over a relatively short period of time (I think 1 month). There's probably more involved here too. Otherwise, if you're asking about just becoming 'influential', so to speak, then it's a matter of having many fans and being considered to provide "Helpful" comments in your reviews. There's probably many other factors, but they guard their algorithm like Google.
I have one account, and one page I want to promote. I can stumble my page once with my one power account. Versus I have 50 stumble accounts and I can stumble my page from 50 different accounts. Pretty simple really.