referrals

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hello everyone i have asked this question before and i didn't get an answer from the person i asked but i would like some help on this.I am new to all the paid to click sites and i keep hearing in discussion after discussion about referrals.What are they and how do you get them-If you have to add your friend i am out of luck because my friends don't do these sites-Are there any other ways-please explain referrals to me??