Google updated its "guidelines and policies for writing reviews for places on Google. These guidelines help to make sure that reviewers understand how to write thoughtful reviews, that readers will find them informative, and that the content of the reviews provide useful feedback for Google Places business owners," informs Google.
"We're also sharing more information about when and why some reviews may be removed from a Place page. The process for reporting a review that violates our policies hasn't changed. You can still report a review using the Flag as inappropriate link found next to each review submitted through Google Maps. When a review is flagged, we'll check to determine if the review violates our guidelines and take action accordingly. And if you're a business owner, you can directly respond to reviews to share your side of the story," explains Google.
More Info: Updated Policy