referrals for free paid survey sites?

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Hi mylotters, I am a member of several free paid survey sites, and have never experimented with a referral program. If you want to joine a survey site, and would be willing to put me as a referrer, send me a p.m. Please put a message here letting me know you have placed the friend request, so I will know and we can work together. IF you have used referral programs, suggestions? tips? advice? which sites are the best? habeebi