KickoffLabs NudgeBar
The nudge bar from KickoffLabs enables you to show who referred one person to your site or to your campaign. KickoffLabs gives everyone in your campaign a unique referral code so that when they share the link to your campaign we can show the person they shared with who invited them to join.
This feature gives leads that extra word of mouth nudge to convert on your site. See it in action here and how to enable it on your KickoffLabs campaign.