Referrals by @Fosters is a simple application which adds a new field on the registration screen for new registrants to input the member who referred them. This is critical to keep track of who referred whom, and allows you to build a network by word-of-mouth. If you offer a closed or private community, this plugin is a MUST to ensure new members are qualified and recommended by existing members. Registered members will see the referral URL on their Account setting page, which they can share with their friends so that they'll be automatically set as referral.
Build a network by referrals, word-of-mouth, and affiliate code with Referrals by @Fosters!