To automatically share your favorite Etsy items on Facebook, you'll need to connect your Etsy account to your personal Facebook Profile.
1.) Click You > Account settings.
2.) Look for the Connected Accounts box on the right hand side of the page.
3.) Connect your Facebook Profile if you haven't already.
4.) Click the box below the Facebook connection to enable Facebook sharing.
Once you've enabled the feature, items you add to your favorites will be posted automatically to your Facebook feed.
Note: Only items that you've added to your favorites will be published on your Facebook feed. This doesn't include shops in your favorites or items from your own shop. Also, items you share will not be posted to your Facebook business Page. Favorites are only posted to your personal Facebook Profile.
You can turn off sharing at any time by unchecking the box below your Facebook connection.