You can now introduce your friends to Rooftop Slushie, get them a special discount for their first purchase and earn rewards while you're at it! You can refer friends to Rooftop Slushie through your email contacts or your contacts on social networks. We call “Referral” any of your friends who joins Rooftop Slushie following your introduction of Rooftop Slushie to the friend through this referral system. We call “Referrer” to the user who refers friends using the referral system. The referral system allows you to share the referral with your connections via an email message, or post the referral on Twitter, Facebook, LinkedIn and personal blogs.