I'm Ann, from the team here at Shopify :)
Great question! At this time, we do not have any promos for Facebook ads or other advertising platforms like we do for Google AdWords. That said, that would definitely be helpful for our merchants, especially those that are just getting started, so I will pass this along! Feedback like this is amazing for our team and hopefully this will be something we can offer in the future.
I hope this helps! If you have any more questions or concerns feel free to reach out to us on this thread :)
Have a great one,