You can add a Facebook Like button to your product pages so that visitors with Facebook accounts can instantly post details of — and their comments about — your products.
To turn on the Facebook Like button:
In your Admin Area, go to Inventory > Products.
Click the three-dot actions menu icon and select All Products Settings.
Select Enable Facebook Like Button.
Click Save.
For further information, see "How to Add Facebook Like and Share Buttons to a Product"!