What pay per click sites that are scam sites, do you know some?

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I have lots of pay per click sites but I don't which those sites that can be trusted. So, I must be sure before joining those sites; these must be real so that my time and money will not be wasted. Do you what are those scam pay per click sites? I am sure your answers are big help for those who are planning to join those sites. Your answers are really big help.