From their website i believe it goes something like this:
I stumble upon a website I like (website A) I give them a thumbs up.
My friend (1) is stumbling in the same categorie as website A and is more likely to receive website A over website B because a friend likes this as well.
Now website A has two tumbs up.
Now person 3, who is in no way related to me or person 1 is stumbling. He happens to tumb up several websites that I and person 1 have thumbed up as well.
He is now more likely to see website A when he stumbles.
Guessing here,
When a website is so good that people actually want to review it, instead of factor 1 in sumbling, it gets a 1,5. And maybe the more reviews, the higher the factor?
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