BigCommerce Store Owners: To add Facebook you will need to install Facebook by Sales & Orders from the BigCommerce app store.
If you are currently only using the feed tool for Google, you can also set up feeds for Bing and/or Facebook at no additional cost. You'll find the button to get started directly above the Feeds panel in your dashboard.
After clicking, you'll be able to select which channel to start. Each option will take you to the respective setup wizard:
Follow the wizards for each additional channel to connect and begin sending a feed.