They usually update from time to time I guess. Even if it's not the PR, sometimes, the inbound links are being updated. I noticed that on the sites that I am handling before. It's normal, and a good thing if your IBLs increase. :P
that's why google is the best, they update their databases from time to time most of the websites increased backlink but there are cases that website decreasing its backlinks.
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what are some good suggestions to up my pr on google right now i am paying about $10,000 a month for google adwords
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