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To say SEO has "changed a lot" would be the understatement of the decade. We'll often see multiple updates per year from Google, including this year's mobilegeddon update from Spring 2015. Not to mention how Google's Panda, penguin, and Hummingbird updates totally shook up the world of SEO. Marketers and SEO Agencies worldwide halted their link-building and keyword obsessed ways and sapped them for a long overdue focus on quality content.