The Google toolbar
If you have the Google toolbar installed in your browser, you will be used to seeing each page's PageRank as you browse the web. But all isn't always as it seems. Many pages that Google displays the PageRank for haven't been indexed in Google and certainly don't have any PageRank in their own right. What is happening is that one or more pages on the site have been indexed and a PageRank has been calculated. The PageRank figure for the site's pages that haven't been indexed is allocated on the fly - just for your toolbar. The PageRank itself doesn't exist.
It's important to know this so that you can avoid exchanging links with pages that really don't have any PageRank of their own. Before making exchanges, search for the page on Google to make sure that it is indexed.
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