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Google Panda is 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.

The Google Penguin Update launched on April 24. According to the Google blog, Penguin is an �important algorithm change targeted at webspam. The change will decrease rankings for sites that we believe are violating Google�s existing quality guidelines.� Google mentions that typical black hat SEO tactics like keyword stuffing (long considered webspam) would get a site in trouble, but less obvious tactics (link incorporating irrelevant outgoing links into a page of content) would also cause Penguin to flag your site.