Review sites like Google do not require reviewers to submit review content. In other words, reviewers have the option of submitting ratings only. Grade.us pulls these reviews into the Reviews page, and includes them in the review stream by default.
Now this might create an undesirable result when auto-sharing reviews to Facebook, or you may not want to display empty reviews in your review stream. Due to this very reason, Grade.us provides a pair of toggles that allow you to prevent empty reviews from being auto-shared or/and added to your review stream widget.