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 invite friends to Rooftop Slushie through your email contacts or your contacts on social networks. We call “Invitee” any of your friends who joins Rooftop Slushie following your introduction of Rooftop Slushie to the friend through this invite system. We call “Inviter” to the user who invites friends using the invite system. The invite system allows you to share the invitation with your connections via an email message, or post the referral on Twitter, Facebook, LinkedIn and personal blogs.