Thank you for reaching out with your questions. You can view this section of our Experts directory to find professionals who specialize in running social media advertisements. Many are based in the United States but there are others who operate in other countries who may also be knowledgeable about running promotions via Facebook in the US, even if they are not based there themselves.
If you're looking to learn more about running Facebook ads yourself, you may be interested in this free course we offer on the Shopify Academy: Facebook Ads for Beginners: Retention and Loyalty. There is also an advanced course you could take afterwards if you're looking to study even more.
Thanks again and please let me know if you have any further queries.
Victor | Shopify Social Care