What is the source of the income in earning through internet?

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Hi friend, I hope every one are doing their good in earning money through internet.I have a small query for all of you.Actually,everyday i will see lots of new sites related to earn money through internet,its good to know,but i always have a doubt,what is the source of knowing them.Is there any secret behind it to get to know.If so,what is that.Please share your opinion on it. Have a nice day.