Drip Source Tags
Drip Source Tags (DSTs) allow you to track the source of people on your list (Facebook ads, for example). When you add a Drip Source Tag to your link, that tag is applied in Drip after someone clicks on the link.
To use Drip Source Tags:
The person who clicks the link must be identified.
Drip Source Tags work just like UTM codes. To turn a regular link into a DST, add the following to the end of your URL:
www.example.com?dst=facebook applies a “facebook” tag to any person who clicks that link.