The answer to this question varies greatly between different sites. Sometimes a couple links from other PR7 or PR8 pages will do. On other hand, you may need hundreds of backlinks from PR3 or PR4 pages.

7. I've acquired many backlinks to my site. Why isn't my PR improving?

There are many reasons why you may not be seeing results. First of all, if you see PR5 for a page, real PR may be PR5.0000 to PR5.9999. You have no way of knowing exact PR of your site. Thus, you are simply not seeing results. Secondly, Google might have done a PR algorithm update. Lastly, PR of pages that are giving you incoming backlinks might have changes, thus changing your PR as well.

8. How often do PR change?

Results may vary (a week to six months).

9. Why is my PR in Google Directory different than my toolbar PR?

Google uses a different scale for measuring PageRank in Google Directory.

10. Why is it so much harder to go from PR6 to PR7 than from PR5 to PR6?

Google Pa geRank value goes up logarithmically. (i.e. going from PR9 to PR10 may look like same as going from PR1 to PR2, but is actually 1000 times more difficult). The exact logarithmic scale is unknown, but there has been speculation that it may be around 5. (i.e. going from PR2 to PR3 is 5 times more difficult than going from PR1 to PR2)

11. I just lost all my PR!

Don't panic just yet! Check to see if your PR is white-barred or grey-barred (white or grey in PR ind icator). If it is white barred, then your PR will probably come back. However, if your PR is greyed, then it means that Google saw your site as having used unethical SEO techniques (e.g. selling/buying PR, keyword stuffing). Also, Google sees http://example.com/abc.htm and http://www.example.com/abc.htm as two different pages. In this case, PR of page is spread between these two UR Ls.

12. If PR is virtually useless, then why is it so expensive to "buy"?

Over years there have been many misconceptions about PR. Sites with higher PR claim that PR is valuable so that they can make more money selling links. Gradually, misconceptions quietly built up.

13. What's up with PageRank formula I see on Net?

You may have seen a formula to determine PR. I cannot say that formula is untrue, but it's implementation of formula that is in question. Just remember, Internet is NOT all about PageRank!

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In conclusion, Internet is most cost effective marketing opportunity ever. By mastering these five fundamental elements to search engine marketing you can be among top performing websites in your industry.