What are the guidelines/rules/hints

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I has started seriously to make a decent money online. One of them is PTC (Pay To Click). I notice that, there is a lot of this site. First, the amount the pay is rather small without the referral (rented) and secondly, whether they are paying or not. Lately, I received e-mail asking me to joint their site (usually maxtrix)and I am tempted to joint as the investment is only US$12 per month and they claim that you can earn millions. Please help if you are awere of the genuine one. Thank you.