Creating Facebook Page posts to sell your Shopify products
You can use Facebook and Instagram by Meta to sync your products to a catalog on Facebook so that you can create marketing activities for your products on Facebook.
For ad creation across the Facebook, Instagram, Messenger or Audience Network, use Meta's Ads Manager.
After you set up Meta's Ads Manager, you can create free Page posts. Facebook Page posts can help you to build engagement on your Facebook Page by letting visitors click a link from a post to see the product in your Shopify store.
It's free to create Facebook posts, because they are not a type of Facebook ad. However, when you set up Facebook and Instagram by Meta, you need to add your payment information to Facebook. If you don't create any paid Facebook ads, then you won't be billed by Facebook.