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How do the millions of online 'pagerank checker' tools work?

Don't get me wrong, pagerank means very little to me, I just wondered how they give you a pagerank number, given that many of them give you a different score to other tools...

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This belongs on SO. Since they obviously answered it previously I'll just close it here. –  John Conde Jun 16 '11 at 12:57
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closed as off topic by John Conde Jun 16 '11 at 12:56

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