I have a question.....please respond

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Ok so I came across a few sites where they say things like : "Free membership...All mail worth 100$, 200$...All PTC worth 100$, 200$" and etc. Should I take that as a scam or do you guys think it is legit? I'm new at this online money-making stuff and don't want to get screwed over. Thank you for all your help!