Which of these are scams??Bug.gs,Bux.to,B_U_X.net,Gagabux

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hey i am in a trouble here .abivee are the ptc sites i join .I have heard some people telling that these are scams and others saying that they are not.so help me with this.If you have got any payment or experiance with any of these sites(Recently) then please let me know it and help to find if they are spam or not. regards