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This is easily the most detailed post on exactly how StumbleUpon processes and serves up pages to users - from the horse's mouth, co-founder Garrett Camp.

One thing I didn't know was that quick stumbles - when you just hit the Stumble button again without voting - are counted as 'soft not-for-me' or 'down' vote. It's not just the ratio of up to down votes, but how many just clicked on through.
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