the best topic discussion to get lots of response

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I've been a member of mylot since last year but I stopped for a couple of months because I got tired and I got a busier in the office. But I realized that mylot.com is one of the best way to earn extra income while at home. I would like to know what is the best topic discussion to begin in order for me to get a lot of response. What do you think? What topic is very interesting?