You can find how often Google updates back links, when was the last update and when new update is going on.

http://www.seocompany.ca/pagerank/page-rank-update-list.html

well u read the article and it was pretty informative.. thanks for sharing.

Useful and informative article, I must say!

Thanks for sharing the link. But actually, it is out of dated now.
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Grain Markets

I haven't seen Google update history yet

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Nice article thanks for sharing

Google has some crazy algorithms no one knows when they change

Eerrmm... That data is from 2008 o_O

Is that still relevant?