What is a participant?
A participant is a single person in your referral program identified by their unique email address. Each participant has their own unique share link, and they can be referrers and/or referred friends.
When someone signs up on your site (either directly or via referral link), GrowSurf adds them as a participant in your campaign. If they were referred, GrowSurf will associate them with their referrer.
You can think of participants as your existing user/customer base (if you import them) plus any new users/customers you get in the future who sign up on your website.
If you have a website and you have integrated GrowSurf with your existing signup form to automagically add new participants, every person who submits that form will get added as a new participant.
To change this behavior, please see When a new visitor submits a form on my site, can I only add them as a new participant if they were referred?