The impact of social signals on SEO has been a lively debate for years. In quick review: social signals are the activities found on social media posts, such as likes, comments, shares and emoticons. Those are obviously good news – it's a sign that people are interacting with your social post! But marketers want to know, "Do these signals also boost the SEO based on post content? Are we getting a better page ranking out of this?"
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via Digital Marketing News