How can I identify causes of a PageRank drop?

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Published on August 19, 2011 9:24:40 PM ● Video Link: https://www.youtube.com/watch?v=kFcJ7PaLoMw

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I use the Google Toolbar to monitor PageRank. I read on the Internet that it gives old and quite unreliable data. Can I have reliable realtime PageRank information about the sites I administer? And how can I identify causes of a PageRank drop? silviot, Torino, Italy

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