Google Pagerank is an important indicator that can help your sites rank higher in SERPs. As confirmed by Matt Cutts, pagerank is among 200+ factors that can determine rankings in SERPs. If you want to boost your pagerank, you need to build as many backlinks as you can to your sites. Those backlinks must be dofollow in order to increase your pagerank.
As usual, you need to find dofollow sites to build backlinks to your sites. However, it is hard to know how many dofollow sites you should focus on. Here are a big list of dofollow forums that you can easily build your own backlinks to your sites FREE:
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