Unnatural links. Everybody talks about them: Webmasters struggle to find tools that could help them identify the rotten apples in their garden. Google sharpens its weapons to catch “the enemy”. Black Hat SEO fans gets the chills and internet users try to avoid them. We all relate to them but do we really know what unnatural links are? What is an Unnatural Link about? In a few words, as it is presented in the Google Webmaster Guidelines, any link that intends to manipulate the PageRank, [...]