Hi, I just see many services here that offer xx to xxx blogposts. are duplicate backlinks from blogposts good for improvement of PR?
I think a link on each post if that post is rated could help a little. If post is same topic as your site it should help. Mutiple links on same post would not help anymore than one link.
i think google filters most of them because of duplicate content. blog posts on xxx blogs is totaly waste of money