Infographics are a very visually appealing and easy-to-follow method for summarizing your content. People would rather link to an infographic than a 1,500+ word article. So, yes, they are relevant and effective. Submitting your infographic to submission sites is just another way to get it seen by a broader audience and typically that site will give you credit for the graphic and link back to your site (one automatic backlink to start with).
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