A campaign to Facebook followers
Target the people that visit you from Facebook.
Let's start with Trigger: Page Visit . Leave the space empty so the app recognizes the visit on your entire website. Next, apply Filters: Email → unknown. Since we don't have the email address to these people, we will send Action: Send a chat message with a kind request to fill in the form that appears on the screen (Action: Delay and Show a form).
Alternatively, let's go with Filters: Email → any which means that the people with the email address in the data base will receive a chat message (Action: Send a chat message & Send a new email campaign).