How much can you earn from internet per month?

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Now many "paid for click" websites are known by people. Of course, many persons are doing their click job online. We can find many so-called payment proofs, and someone even said he or she had earn over $100.00 per day, and over $3,000.00 per month. But I can't believe it till now. If so, all people can do "paid for click" instead of other jobs. Are you doing paid for click? Can you earn money really from it. Who can really earn over $1,000 from this kind of work?