You know I just went on stumbleupon, I think what Sam said is very valid, I go on stumbleupon because I want enrichment from the interests I have when I registered on it, If I find content that is half assed written or just doesn't capture my attention, It's quickly going to be disliked and I'll hit that stumble button faster than you can say holy pancakes.
so what you want to focus on is interesting content, write something you're passionate about, or something you just learned that's enlightened you or made you feel happy. if you also need ideas go on magazine.com and look at what's being published on the front covers of magazines. you will quickly pick up an idea of whats interesting, because magazines will only goto print if they know there is a big interest on a particular topic or a huge market for it, otherwise their wasting their time.
I always heard people talk about the power of Stumbleupon but I never knew how to harness it. I really do appreciate this comprehensive guide. I'm about to give it a great review right now 😉