Are these sites credible money making sites??

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i have been registring for quite a few ptc sites, are they all credible sites, and have any of you guys been paid from them??? please let me know what ones you think are best and the one to beware off. Thanks. the list is below. buxmatrix bux.gs neobux mithbux, wordlinx, clixsense adcrusader ara-bux PPLinx, ForeverClix, CashSwing, RevBux, VelvetClix, Bux-Matrix, ClixOfChange, EgyptianClicks, ChristyClix, saturn bux, infinite bux please i would appreciate if you can also inform me on any you use and feel that is the best that might not be here. From what i have learnt a lot of people say it is neobux