When pages are new, they have a default
PR. This is very useful as it gives you your on-page relevance value without the pollution of the incoming link factors.
This time around, Google is doing a deep crawl. During this crawl, the default
PR is replaced with the
PR of inbound links. As the crawl continues, sites move up and down the SERPs depending on which data centre you are querying and how up-to-date that centre is.
It takes over a month for the crawl updates to be completed and to have all the data centres carrying the same
PR.
To keep visible, the easy way and the one that explains why sites that keep having new content do well, is to continue to add new content for your most profitable phrases. The other option is to have some highly relevant inbound links before the deep crawl starts so that your site remains with a
PR of at least PR1.
Where a program like wordpress provides duplicate URLs, block those duplicates in the robots.txt file - just make sure that you don't block the URL which contains the
PR.

Bookmarks