Search engine optimisation is still very important despite the fact that social media is around. You can get traffic to your blog organically if you know SEO well.
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That's quite not true. You can boost your post and target to the people who might be interested on the content. By doing so, you will drive engagements from strangers.If you will compare the number of searchers with the number of users of social media I'm sure you will still respect the SEO work. Social media is almost limited to the users in your circle. It is rare when a stranger would reply to your post. In SEO a searcher has no bias because he uses the search engine to find what he needed.