Link building must be of very high quality then only it will have a great effect on traffic and searching engine ranking.
Always check the Page Rank of site in which you are trying to make link. Check that the link must be dofollow. If you are trying to make link in the forums then make link in the post instead of profile because someone may be interested in the post but no one would have interest in your profile. And try to find post which is relevant to your website which is you are linking back. And if you are trying to make link in the blog comment. First see hoe much comments with links are there and then look weather link is dofollow or not. If dofollow then write the comment very much relevant to topic as you are the part of the discussion. So don't waste time in commenting all the blog and waiting to be approved and getting disappointed.
Always try to find page rank 5+ sites for forum posts. They really have a very great effect on the traffic. If you want the list of high PR do follow forums. Then ask me for that in comment. I will provide you at very reasonable prices.
