PTC sites

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I just wondering what would be the best strategy in working with PtC sites. Is it wiser to sign up with several PTC sites and click till I drop on my chair or just join few and concentrate on getting referrals? I think I already did both options but with no success..Im not good in getting referrals. With your own experiences on PTC job what can you share to others like me who really want to earn more on this kind of work? Please share your tips and tricks.. NO promoting of referral links please..