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I’ve seen massive causation between rankings and rich snippet reviews. Here is an example of adding review schema to our own website, and what the rankings did. We launched our new website with review schema about 3 weeks ago. One use case would not be enough data, but I have seen this more than 10 times in the last 3 months.
 
 review schema increases rankings
 
Ranking 7 ‘Utah SEO
 rich snippets increases rankings
 
Ranking 3 ‘National SEO

 

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