Loved the mention of Bill Slawski's answer:
"A person who uses things like keyword density and gateway pages is not an SEO, and never has been.
But, if you need help with hreflang, canonical link elements, parameter handling, rel prev and next values for pagination, XML sitemaps for pages and images and videos and news, Google Plus authorship markup, Facebook’s Open Graph meta data, schema.org implementation, and many other issues that great content alone will not solve, an SEO can help you with those."
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