20 Questions to Ask Before You Hire an SEO Agency in Post Panda/Penguin Era
Search Engine Journal
Question #1 – What do You Know About the Recent Google Algorithm Updates? Any SEO agency should be familiar with the Panda and Penguin updates, but there are other Google search algorithm updates that they should have knowledge of as well.
Diversification key for improving online marketing, SEO and Google rankingsToronto Star
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