Bonus entries for referrals are available in most campaign types. Enable this feature by visiting the Settings tab and clicking Bonus Entries.
Classic Campaign Templates:
You can award up to 25 additional (bonus) entries per referral.
Bonus entries are tracked via a unique URL given to a user who has entered your offer. After they enter, users get the link which they can copy, or they can use the share buttons. The share buttons are customizable, so you can choose which buttons you’d like displayed. 
Frequently Asked Questions/Concerns:
Identifying bonus entries in your data:
In the Entries or Participants (Classic Campaigns) section of your campaign dashboard or in the Entries export, bonus entries will appear just below the referred entry and will only display an email address without the other form data. In the Entries export, you will see the referrer in the “email” column and the referred entrant in the “from_email” column.
In the example below, the top row is test1@woobox.com’s original entry. They then shared their unique referral link. The middle row shows test2@woobox.com’s entry via the referral link, and the bottom row shows test1@woobox.com’s bonus entry.
