Hello folks. I like interesting but not technique related topics on link building. A question that I have is: How is link and page authority build? We know that for a given page to have authority we need backlinks from authority pages. Talking about PR, if you have PR 6, let's suppose that it's because one PR7 links to you, or a lot of PR4 links to you, something like this. BUT, where does this chain begins? How much PR0 indexed pages you need to have linking to you, for you to have PR2 or 3? Please, if anyone knows this kind of link logic, give me some interesting info.. Thanks folks!