I have seen many people asking for niche related link building. People Think that only site with same niche are to go with. But in reality it's not the case and it's not what Google only want. What happens when commenting on niche related do-follow blogs. Imagine you have a health related website and you want to build quality backlinks for it. The people tend to only search for niche related blogs and websites to comment on. Many guys here think that link building on niche related blogs is the best way to gain SERP. But it's wrong! When commenting on niche related blogs, you will see other people commenting on it too with there heath sites. Seeing that it is a health site, you comment on it too. But when Google spiders crawl's that page for to gather backlinks for sites, they only select the best health sites with good unique content and which are established. On these accounts they judge the weight of link juice. Now imagine 15 sites, all health related comment on the blog. The Google will only give importance to best 5-7 sites(as per their algorithm or something). Other sites will not get that quality which they were looking for. But it's not the same with a non related niche site. When commenting on different and diverse niche the weight of each link will be heavy then commenting on only niche related sites. When Google will go to the site, in which your link is placed, it will give more importance to your site, then those which are niche related. It's a proven fact which many people here will offend. But it's the way it is. People here provide many do-follow commenting service and the newly emerged A. Edwards backlink packs. This is based on this technique only.