The Facebook Optin URL is available at Lists > Social Optin Options as below
Here you create the content to use in a “Facebook Share” post.
In your FB Post it will be formatted as below.
Should you only require the Unique List ID, maybe when creating a Facebbok Button or Combined Optin Form, they are available as below by clicking Lists.
To be able to use the Facebook Optin URL you have to authorise its use in your SendReach Account Optin Form.
To do so first login to your Facebook account, then go to https://developers.facebook.com. If you already have a Developer Account you will be automatically looged into it, if you do not have a facebook developer Account, then create one.
Now click on “My Apps” and follow the steps below.
You will then be able to use the FB Optin URL as created above.
There are a couple of images applicable to using a FB Optin URL available for download below