This is a bit random and maybe pointless, but just wanted to hear people's views on how pagerank is calculated - I'm only starting this thread because I read another thread about a pr6 site that ppl were saying wasn't genuine because the backlinks didn't add up to pr6. Anyway, looked today at my linkedin page (for one of my sites), and it has a pr6! My site only has pr4 (was pr5 until the last update). I have looked at some other linkedin pages and they mostly have lower PR so just wondering why my page has pr6 - I do have a link to iron my homepage and obviously it might be pulling PR from linkedin homepage, but just wondering if anyone has any views on why it has such a high PR? Also, is there any value in a link on the page back to my site - as it would probably be no follow I'm sure?