Slidejoy Paying phone app?

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So I was having this discussion with my sister about these unique online-money-making experiences, which she occasionally dabbles in (but not nearly as much as I do), and she actually told me about this opportunity for this app called "Slidejoy" that you download on your smart phone. Apparently, it puts ads on your screen while it's locked (or something, I am not quite sure I understand the jist of it fully) and apparently it advertises that you can make "up to $15 a month" (or something like that) just using it. Has anyone heard of this, had any experience with this? Or have had any experience with a similar app? I have never heard of such a thing, but it sounds cool. Lo and behold, my sister did end up downloading it and has been using it for a few days, saying she is averaging twenty cents per day. Not quite sure what that adds up to in a month, but I am thinking about $4 perhaps. Ha. How about you? Any insight on this?