You can follow these steps to add Facebook Reviews to Google Sites.
#Option 1. Add single Facebook Review to Google Sites
#1 . Click 3 dots on the right of a Facebook Review > Click Embed
#2 . Next, click Copy Code
#3. You can add it to Google Sites via Embed Feature.
#4 . Paste your Facebook Review to embed code box
#5 . Result
#Option 2. Add Multiple Facebook Reviews to Google Sites
To add multiple Facebook Reviews to Google Sites, you can use this free tool. Follow these steps.
#1. First, access this free tool and click Create widget for free
#2. Choose Facebook Reviews layout and click Continue with this template .
#3. Next, After add your Facebook Page URL
You can also set layout, style here then click Add to website for free.
#4. Next, Click Publish on top right
#5. Choose Free Plan and click Copy Code .
#6. You can add it to Google Sites via Embed Feature.
#7. Paste your embed code
#8. Click Insert
#9. Result