Enabling social sharing gives your brand the opportunity to be seen by your customers social following. When customer’s share your product on their social sites they are providing you with free marketing as well as an endorsement of your brand with no effort on your part.
ENABLE SOCIAL SHARING
Enabling Social Sharing is easy as checking the box located next to the network you wish to allow.
Providing a Facebook Application ID for use with the Social Media Sharing feature is recommended, but optional. When you provide this ID, it enables Facebook's Open Graph Meta Tags, which let you administer Facebook Pages for products (where you can share product updates and engage with customers who have "Liked" a product), and use Facebook Insights to track key metrics.
While the Social Media Sharing feature has been designed to share the correct product image, product name, and product description even in the absence of a Facebook Application ID, because the Facebook "Like" feature belongs to a third-party site, this feature may change or be deprecated over time. Providing a Facebook Application ID helps to ensure that the correct product image, product name, and product description continue to be shared in the event of some feature changes.
Note: When you provide a Facebook Application ID, Facebook Open Graph Meta Tags will be added to your store's index page. These meta tags will not affect page load time for your store. For directions on how to create a Facebook Application ID go here.