After penguin and Panda update some of the link building techniques are dead so we must be careful in link earning.
Yes it is very Google related, in fact its a Google algorithm update, and if your site has poor backlinks and ppr content then you are prone to this update.
a Penguin is an aquatic, flightless bird living almost exclusively in the southern hemisphere and a Panda is easily recognized by its large, distinctive black patches around the eyes, over the ears, and across its round body, and is native to central-western and south western China. Conclusion not related to Google. But Unless you're talking about the annoyingly famous Google updates named after this cute animals. This updates are designed to reduce rankings for low-quality sites—sites which are low-value add for users, copy content from other websites or sites that are just not very useful. At the same time, it will provide better rankings for high-quality sites—sites with original content and information such as research, in-depth reports, thoughtful analysis and so on.