As you all know, negative SEO is not new, in fact, Google has said it is rare but possible since 2007. Sites as large as Expedia may have suffered from it and Google had to reword their documentation on the topic.
But now that we have SEOs threatening clients with negative SEO, it is more of a concern out there.
WebmasterWorld administrator, Engine, said on Webmaster World that recently, "negative SEO is now much easier to do now than it was...
