link buliding:
Search engines view links at votes, with some votes counting more than others. To get high quality links (that help your site rank better) you need to participate in the social aspects of your community and give away valuable unique content that people talk about and share with others. The below Google TouchGraph image shows a small graphic representation of sites in the search field that are related to SeoBook.com based on linking patterns. In this post Matt Cutts suggested that Google is getting better at understanding link quality. Search engines want to count quality editorial votes as links that help influence their relevancy algorithms.
