How do I communicate with users who said that they would recommend our product?

You can close the loop with your promoters in the following ways:    

1) In the code, you can pass us a user identifier, ideally an email address, and with that you will be able to contact users directly through our dashboard (or connect us to your other systems, like Intercom, for follow-up) 

2) Alternatively, you can use the optional 'third screen' in the survey that triggers follow-up through a Twitter share, Facebook like or referral link.