We all know that building backlinks on a high PR page with low OBL will have a great impact on owr websites so thats what everyone wants. So i started to gather a list of pages with pr4-7 and OBL<30, i only gather pages where i can comment to get a backlink. Most of the pages i find are already spamed with comments so it's very hard to find what i want. I have found a few blogs with thousands of posts and all pages before end Aug 2013 have PR1-6 (that is when google last updated PR) and these pages are usualy spamed with comments. But then i had an ideea, people are focusing to make backlinks on pages posted before last google pr update because they can see the pagerank. But from what i know the pagerank update were only for public view as they calculate the pagerank of sites and pages on a regular basis for their rankings but it is just not shown to the mases. So since a blog has all pages with a good pr and all the people are focusing to build backlinks on pages posted before september 2013 because they can see a page rank coudn't be that those pages actualy don't realy have the dispayed PR and pages post september 2013 can have the value of PR1-6 page also despite their pr isn't visible for us ? and also these pages aren't spamed with backlinks .... I would like some opinions about my ideea from some pro people as i am not entirely sure about what i said about pr updating internaly and maybe if someone tried this kind of linkbuilding. This is mostly about quality over quantity links, Lets say i build 5 backlinks on the same blog on 5 different pages with pr3 and OBL=50, can be more valuable 5 backlinks from pages posted after last google pr update with unapdated pr and OBL<5 that would sure got pr3 if there were a pr update for them too ? I hope there are people with more acurate informations that can give some infos here.ty.