Social sign-in for customer accounts
In addition to the default passwordless sign-in experience for customer accounts, you can connect your Google and Facebook accounts from your Customer accounts settings to let customers sign in using their social credentials. Activating social sign-in for customer accounts can provide customers with a faster sign-in experience through familiar authentication methods. You can activate multiple social sign-in methods on your store.
The only customer data that syncs to Shopify when you use social sign-in is the customer's email address.