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Play around with it
Basically, StumbleUpon is a social media thang. You give a "thumbs up" to sites you think are cool. When you "stumble" to the next site, it gives you a site that should match up to your likes based on what you have thumbed-up before.
What I'm going for is for Junkies to Stumble Up my posts, and see if that brings in casual traffic from other scifi/horror/suspense liking Stumble users.