Enabling or disabling the Request Users to Confirm Their Registration feature in the Viral Share booster settings results in two different types of actions that the users and their referrals must take in order to register. 
Enable Request Users to Confirm Their Registration
User Activation:
When the Viral share Campaign is set up to use the Request Users to Confirm Their Registration feature, after registering, the user must first confirm his email (click on the activation link) before he will be active and can start getting referrals.
The first time users register, they will get an email asking them to confirm their email by clicking on the confirmation link.
Once clicked, the users will be redirected to a Registration confirmation page and will also be able to grab their Share Link.
Referral Activation:
When a user gets started, the Number of Current Referrals reflected in the Viral Share block will be ‘0‘ by default, because the user has not shared the link with anybody.
Once they start sharing the link and their friends begin to opt in, the Number of Current Referrals will remain ‘0’, until the user’s friends confirm their email as well.
When you say that your Viral Share Campaign Requires Confirmation, it means that the user’s referrals must confirm their emails as well, in order for them to count towards that user’s number of referrals.
Disable Request Users to Confirm Their Registration
User Activation:
When the Request Users to Confirm Their Registration feature is disabled, after registering, the user is immediately activated and can start getting referrals.
After opting in, the user will be redirected to the registration confirmation page, where they can grab their Share link.
Referral Activation:
When a user gets started, the Number of Current Referrals reflected in the Viral Share block will be ‘0’ by default, because the user has not shared the link with anybody.
Once the users start sharing the link and their friends begin to opt in, these registrations immediately count towards that user’s number of referrals.
Related Articles
Setting up your Viral Share Campaign
Step 02 – How to enable registration for the Viral Share Campaign
Step 03 – Setting up the Viral Share Thank You Page