Most powerfull search engine Google ignore purchase backlinks like NoFollow backlinks. Take your website or blog to the top page of search engine such as Google, Yahoo, Bing, Aol and others. There are many ways to optimize your website or blog.
Backlink is good way. Forum posting is the most powerful way for dofollow backlinks. I share huge list of top high PR 5 dofollow forums. More you want to High PR 9, PR 8, PR 7, PR 4, PR 3, PR 2, PR 1, PR 0 Dofollow Forum List.