Trying to figure out how StumbleUpon works? Here is an interesting article to get you started!
"Are you stumped as to how to incorporate StumbleUpon into your marketing plans? You are not alone; many people are unsure how to tap into one of the top traffic referring social media sites. StumbleUpon’s elusive workings mean that it isn’t easily manipulated, which is great for the consumer. While maddening for the marketer, it is also a good thing. It will result in targeted authentic organic traffic to your site – if you can get it discovered. Try these 5 tips to increase your chances."