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September 21st, 2007 
QuadsZilla Via Andy Beard, we find Stumbleupon mathematics for stumblers.
We may be totally wrong so just a heads up but I hope this will at least give you some idea of what your thumb up is doing.
One Theory Point:
The audience score was based on number of fans, number of pages thumbed up, number of pages thumbed down and number of reviews written. The score is what determines how much stumble juice a person carries.
And possible working Algorithm:
(Initial stumbler audience /# domain) + ((% stumbler audience /# domain)+ organic bonus – nonfriend) – (((% stumbler audience + organic bonus) + N
Only those inside stumble know for sure, but this Stumbleupon formula looks like it could be close to right.
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