Do you read reviews before you book a hotel, a B&B, a restaurant, etc.?
By the same token, do you write reviews when you are back home? Did you have some awesome wine and a fantastic experience in a little known bar in Venice? Was the apartment you rented in Victoria the absolute perfect spot? Did the hotel in Milan provide customer service that was over the top?
If so, write a review. Other travelers appreciate it and you may help someone decide what they want to do and where they want to go.