I'll give you my best tip for free, I don't get referrals from links until AFTER they are ready to sign up. Links close very few sales for anything and that's what you are doing when you get a referral, you are selling them on the idea of joining. Then keep in mind that people buy with emotion and defend with logic. Don't get on the wrong side of the equation. Talk about how much fun you had with your extra money, not how you make 15 cents a day. Even better, show them how you can take what you earn here and turn it into real money.