Since most blackhat techniques are dead, unscrupulous webmasters and SEO companies have resorted to raising their own sites, by taking down yours. It gets more and more common everyday and I see it A LOT.
Read more here: Identifying and Preventing Negative SEO Attacks - 'Net Features - Website MagazineOne thing many Web professionals have noticed over the last two or three years is the enormous rise in negative SEO techniques. Negative SEO is threatening safe, organic and natural search engine growth. Before we dive into the finer details, let’s answer the burning question: -