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If it has no author name, then it's likely fake. The only way to know whether this person wrote your business review is by looking at their profile and seeing if they have any other reviews on Google or any other sites like Yelp. If they do have other reviews, look at them to see if the content matches up with what you see in the new one you just received from them (not all people will write about themselves). If so, then there's no doubt that this is an authentic review!