It's a common question and one of the main reasons we partnered with www.reviewease.biz.
ReviewEase acts as an aggregator for all your reviews, which means you can have Google Reviews, Facebook, TripAdvisor, eBay, Etsy, and lots more grouped together in one place. A customer can leave a review easily, depending on where they have an account. Ideally, you want all your reviews on Google, but that's not always possible. The aim is to get reviews and help your customer leave one. Positive reviews, no matter where they are entered, are very important.
Visit www.reviewease.biz to find out more about all their features and benefits.