My main strategy in link building focuses on forums and blog posting. Forums and Blog comments are a great way to promote content, diversify anchor text and build out a natural link profile. I start with finding high quality blogs and forums that are relevant to yours (or the site you plan to link to). The forum and blog comment links I build come from blogs I read regularly and others I find on my Twitter feed and yahoo answers. To look for topical niche blogs, I use Google blog search + advanced search operators. I then post at least 5-10 articles in the forums to make the accounts feel genuine and then post a non-spam article with link to your website with an anchor text. Anchor text is a very effective strategy in back-linking where your site’s url is hyperlinked with a keyword. Back-linking is a proven strategy that increases Google ranking very effectively.