How do you gain more referrals with PTC websites?

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I have recently joined a few PTC websites and they are pretty good. I'm getting a ton of ads to click and my earnings are growing at a faster rate than most PTC sites I've joined in the past. I think I could do well with these sites if I were able to gain more referrals. Does anybody have any suggestions to gain referrals? How do you recruit mylot friends and users to my PTC websites without violating any mylot rules? Have you had success with PTC sites? Do you have many referrals?