Google has been very clear about their feelings regarding unnatural links. Their recent actions resounded deeply within the SEO community and have inspired a higher level of discourse around things like content, quality and scalability.
In the wake of Penguin, most SEOs have abandoned their efforts with public blog networks, article galleries, link purchases, directory submissions and automated tools. Most SEO advice now includes concepts like “link earning” and focuses on “content marketing” as the preferred method of acquiring links. Upon closer evaluation, however, these new buzzwords don’t stand up to scrutiny.