I am wondering how many back link with different PR, will grow PR to next level? Is there any formula likely? And what about links post on forums? I find most DP member alway include their site's link, so that also grow the PR? If there are 1000 post, then there will be 1000 back link???
I found something a few days ago that you may interested! http://www.kenkai.com/google-pagerank-table.htm
Thanks Richie_Ni, really great info, but I am confused about the order of the table: 2,795,522 PR8 links will make a PR1 site???
I don't think it makes much difference to PR. I personally include links to pages that may be relevant to this sites audience - for the free exposure of my site. This also makes sure that the link is context-relevant: a forum on internet/SEO/adsense and links to parts of my website on internet/myspace/SEO. Context-relevant links are more likely to be used by google to rank a website in the serps. (please notice I did NOT refer to PR as a motive - as PR is pretty unimportant in ranking these days). I don't use my signature to link to those parts of my site that are about spirituality - though that is by far the largest part of my site. Those are unrelated links and therefore not likely to help me in the google-serps.
Your welcome! I bet you did get something wrong. It means if you want to get a PR8,you should have 2,795,522 PR1 backlinks!
I think it helps, for my 1 month old site the only thing i done was post in forums and i have a prediction of PR4.