Suitable Competition

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I have just started a fb page. I wanna have a competition to keep my fans excited n tuned to my page To be frank, I do not have cash in hand to give away prizes So I am planning on - asking the fans to download short videos from sharecash & use that video as a clue to find answer.In this way I'll earn some cash & can share that with the winner as well Now I need your guidance & help here.. Can somebody give a mechanism for it ?