Google has quietly updated the link schemes document under their Webmaster guidelines to add large-scale guest posting, advertorials and optimized anchor text in articles or press releases to the list of types of links that violate their guidelines. The new guideline examples that were added to this document include: Large-scale article marketing or guest posting campaigns with keyword-rich anchor text links Advertorials or native advertising where payment is received for articles that include links that pass PageRank Links with optimized anchor text in articles or press releases distributed on other sites. Google also removed these guideline examples: Linking to web spammers or unrelated sites with the intent to manipulate PageRank Links that are inserted into articles with little coherence Full article: http://searchengineland.com/google-adds-large-scale-guest-posting-advertorials-optimized-anchor-text-to-list-of-link-schemes-168082