How much money do you usually make per month online?

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I am a college student looking to make a little extra spending money on the side. I do not have time for a part time job because of school work, and I am looking to combat the price of buying my own gas and food. I was wondering how profitable these online money making strategies are and if they are worth my time. I have signed up for a few PTC and survey sites, as well as myLot, of course. My questions are how much money do you usually make per month, and what kind of online money making tactic do you find most profitable? Thank you.