Do you have an integration with Facebook?
While we don't have a native integration with Facebook, you can connect Facebook and EmailOctopus using Zapier.
Just go to the EmailOctopus integration page on Zapier and type "Facebook" into the "Search for apps to connect" field:
You will see several different Facebook options, so just select the one that works best for you:
You will then be able to connect the Facebook option you choose with EmailOctopus:
Not all zaps on Zapier are free, so you should view Zapier's pricing here.